fix(http2): fix settings, window size handling, and dynamic header buffer allocation (#26119)

## Summary

This PR fixes multiple HTTP/2 protocol compliance issues that were
causing stream errors with various HTTP/2 clients (Fauna, gRPC/Connect,
etc.).
fixes https://github.com/oven-sh/bun/issues/12544
fixes https://github.com/oven-sh/bun/issues/25589
### Key Fixes

**Window Size and Settings Handling**
- Fix initial stream window size to use `DEFAULT_WINDOW_SIZE` until
`SETTINGS_ACK` is received
- Per RFC 7540 Section 6.5.1: The sender can only rely on settings being
applied AFTER receiving `SETTINGS_ACK`
- Properly adjust existing stream windows when `INITIAL_WINDOW_SIZE`
setting changes (RFC 7540 Section 6.9.2)

**Header List Size Enforcement**  
- Implement `maxHeaderListSize` checking per RFC 7540 Section 6.5.2
- Track cumulative header list size using HPACK entry overhead (32 bytes
per RFC 7541 Section 4.1)
- Reject streams with `ENHANCE_YOUR_CALM` when header list exceeds
configured limit

**Custom Settings Support**
- Add validation for `customSettings` option (up to 10 custom settings,
matching Node.js `MAX_ADDITIONAL_SETTINGS`)
- Validate setting IDs are in range `[0, 0xFFFF]` per RFC 7540
- Validate setting values are in range `[0, 2^32-1]`

**Settings Validation Improvements**
- Use float comparison for settings validation to handle large values
correctly (was using `toInt32()` which truncates)
- Use proper `HTTP2_INVALID_SETTING_VALUE_RangeError` error codes for
Node.js compatibility

**BufferFallbackAllocator** - New allocator that tries a provided buffer
first, falls back to heap:
- Similar to `std.heap.stackFallback` but accepts external buffer slice
- Used with `shared_request_buffer` (16KB threadlocal) for common cases
- Falls back to `bun.default_allocator` for large headers

## Test Plan

- [x] `bun bd` compiles successfully
- [x] Node.js HTTP/2 tests pass: `bun bd
test/js/node/test/parallel/test-http2-connect.js`
- [x] New regression tests for frame size issues: `bun bd test
test/regression/issue/25589.test.ts`
- [x] HTTP/2 continuation tests: `bun bd test
test/js/node/http2/node-http2-continuation.test.ts`

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
This commit is contained in:
Ciro Spaciari
2026-01-22 14:35:18 -08:00
committed by GitHub
parent 85080f7949
commit 2582e6f98e
17 changed files with 2589 additions and 205 deletions

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@@ -7,6 +7,9 @@
"dependencies": {
"@astrojs/node": "9.1.3",
"@azure/service-bus": "7.9.4",
"@bufbuild/protobuf": "2.10.2",
"@connectrpc/connect": "2.1.1",
"@connectrpc/connect-node": "2.0.0",
"@duckdb/node-api": "1.1.3-alpha.7",
"@electric-sql/pglite": "0.2.17",
"@fastify/websocket": "11.0.2",
@@ -184,10 +187,16 @@
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"@bufbuild/protobuf": ["@bufbuild/protobuf@2.10.2", "", {}, "sha512-uFsRXwIGyu+r6AMdz+XijIIZJYpoWeYzILt5yZ2d3mCjQrWUTVpVD9WL/jZAbvp+Ed04rOhrsk7FiTcEDseB5A=="],
"@bundled-es-modules/cookie": ["@bundled-es-modules/cookie@2.0.0", "", { "dependencies": { "cookie": "^0.5.0" } }, "sha512-Or6YHg/kamKHpxULAdSqhGqnWFneIXu1NKvvfBBzKGwpVsYuFIQ5aBPHDnnoR3ghW1nvSkALd+EF9iMtY7Vjxw=="],
"@bundled-es-modules/statuses": ["@bundled-es-modules/statuses@1.0.1", "", { "dependencies": { "statuses": "^2.0.1" } }, "sha512-yn7BklA5acgcBr+7w064fGV+SGIFySjCKpqjcWgBAIfrAkY+4GQTJJHQMeT3V/sgz23VTEVV8TtOmkvJAhFVfg=="],
"@connectrpc/connect": ["@connectrpc/connect@2.1.1", "", { "peerDependencies": { "@bufbuild/protobuf": "^2.7.0" } }, "sha512-JzhkaTvM73m2K1URT6tv53k2RwngSmCXLZJgK580qNQOXRzZRR/BCMfZw3h+90JpnG6XksP5bYT+cz0rpUzUWQ=="],
"@connectrpc/connect-node": ["@connectrpc/connect-node@2.0.0", "", { "peerDependencies": { "@bufbuild/protobuf": "^2.2.0", "@connectrpc/connect": "2.0.0" } }, "sha512-DoI5T+SUvlS/8QBsxt2iDoUg15dSxqhckegrgZpWOtADtmGohBIVbx1UjtWmjLBrP4RdD0FeBw+XyRUSbpKnJQ=="],
"@csstools/color-helpers": ["@csstools/color-helpers@5.0.1", "", {}, "sha512-MKtmkA0BX87PKaO1NFRTFH+UnkgnmySQOvNxJubsadusqPEC2aJ9MOQiMceZJJ6oitUl/i0L6u0M1IrmAOmgBA=="],
"@csstools/css-calc": ["@csstools/css-calc@2.1.1", "", { "peerDependencies": { "@csstools/css-parser-algorithms": "^3.0.4", "@csstools/css-tokenizer": "^3.0.3" } }, "sha512-rL7kaUnTkL9K+Cvo2pnCieqNpTKgQzy5f+N+5Iuko9HAoasP+xgprVh7KN/MaJVvVL1l0EzQq2MoqBHKSrDrag=="],

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@@ -0,0 +1,93 @@
/**
* Node.js HTTP/2 server fixture for testing CONTINUATION frames.
*
* This server:
* 1. Accepts requests with any number of headers
* 2. Can respond with many headers (triggered by x-response-headers header)
* 3. Can respond with large trailers (triggered by x-response-trailers header)
*/
const http2 = require("node:http2");
// Read TLS certs from args
const tlsCert = JSON.parse(process.argv[2]);
const server = http2.createSecureServer({
key: tlsCert.key,
cert: tlsCert.cert,
// Allow up to 2000 header pairs (default is 128)
maxHeaderListPairs: 2000,
// Larger settings to avoid ENHANCE_YOUR_CALM
settings: {
maxHeaderListSize: 256 * 1024, // 256KB
},
});
server.on("stream", (stream, headers) => {
stream.on("error", err => {
// Ignore stream errors in fixture - test will handle client-side
console.error("Stream error:", err.message);
});
const path = headers[":path"] || "/";
// Count how many headers we received (excluding pseudo-headers)
const receivedHeaders = Object.keys(headers).filter(h => !h.startsWith(":")).length;
// Check if client wants large response headers
const numResponseHeaders = parseInt(headers["x-response-headers"] || "0", 10);
// Check if client wants large trailers
const numResponseTrailers = parseInt(headers["x-response-trailers"] || "0", 10);
// Build response headers
const responseHeaders = {
":status": 200,
"content-type": "application/json",
};
// Add requested number of response headers
for (let i = 0; i < numResponseHeaders; i++) {
responseHeaders[`x-response-header-${i}`] = "R".repeat(150);
}
if (numResponseTrailers > 0) {
// Send response with trailers
stream.respond(responseHeaders, { waitForTrailers: true });
stream.on("wantTrailers", () => {
const trailers = {};
for (let i = 0; i < numResponseTrailers; i++) {
trailers[`x-trailer-${i}`] = "T".repeat(150);
}
stream.sendTrailers(trailers);
});
stream.end(
JSON.stringify({
receivedHeaders,
responseHeaders: numResponseHeaders,
responseTrailers: numResponseTrailers,
path,
}),
);
} else {
// Normal response without trailers
stream.respond(responseHeaders);
stream.end(
JSON.stringify({
receivedHeaders,
responseHeaders: numResponseHeaders,
path,
}),
);
}
});
server.on("error", err => {
console.error("Server error:", err.message);
});
server.listen(0, "127.0.0.1", () => {
const { port } = server.address();
process.stdout.write(JSON.stringify({ port, address: "127.0.0.1" }));
});

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@@ -0,0 +1,421 @@
/**
* HTTP/2 CONTINUATION Frames Tests
*
* Tests for RFC 7540 Section 6.10 CONTINUATION frame support.
* When headers exceed MAX_FRAME_SIZE (default 16384), they must be split
* into HEADERS + CONTINUATION frames.
*
* Works with both:
* - bun bd test test/js/node/http2/node-http2-continuation.test.ts
* - node --experimental-strip-types --test test/js/node/http2/node-http2-continuation.test.ts
*/
import assert from "node:assert";
import { spawn, type ChildProcess } from "node:child_process";
import fs from "node:fs";
import http2 from "node:http2";
import path from "node:path";
import { after, before, describe, test } from "node:test";
import { fileURLToPath } from "node:url";
const __dirname = path.dirname(fileURLToPath(import.meta.url));
// Load TLS certificates from fixture files
const FIXTURES_PATH = path.join(__dirname, "..", "test", "fixtures", "keys");
const TLS_CERT = {
cert: fs.readFileSync(path.join(FIXTURES_PATH, "agent1-cert.pem"), "utf8"),
key: fs.readFileSync(path.join(FIXTURES_PATH, "agent1-key.pem"), "utf8"),
};
const CA_CERT = fs.readFileSync(path.join(FIXTURES_PATH, "ca1-cert.pem"), "utf8");
const TLS_OPTIONS = { ca: CA_CERT };
// HTTP/2 connection options to allow large header lists
const H2_CLIENT_OPTIONS = {
...TLS_OPTIONS,
rejectUnauthorized: false,
// Node.js uses top-level maxHeaderListPairs
maxHeaderListPairs: 2000,
settings: {
// Allow receiving up to 256KB of header data
maxHeaderListSize: 256 * 1024,
// Bun reads maxHeaderListPairs from settings
maxHeaderListPairs: 2000,
},
};
// Helper to get node executable
function getNodeExecutable(): string {
if (typeof Bun !== "undefined") {
return Bun.which("node") || "node";
}
return process.execPath.includes("node") ? process.execPath : "node";
}
// Helper to start Node.js HTTP/2 server
interface ServerInfo {
port: number;
url: string;
subprocess: ChildProcess;
close: () => void;
}
async function startNodeServer(): Promise<ServerInfo> {
const nodeExe = getNodeExecutable();
const serverPath = path.join(__dirname, "node-http2-continuation-server.fixture.js");
const subprocess = spawn(nodeExe, [serverPath, JSON.stringify(TLS_CERT)], {
stdio: ["inherit", "pipe", "inherit"],
});
return new Promise((resolve, reject) => {
let data = "";
subprocess.stdout!.setEncoding("utf8");
subprocess.stdout!.on("data", (chunk: string) => {
data += chunk;
try {
const info = JSON.parse(data);
const url = `https://127.0.0.1:${info.port}`;
resolve({
port: info.port,
url,
subprocess,
close: () => subprocess.kill("SIGKILL"),
});
} catch {
// Need more data
}
});
subprocess.on("error", reject);
subprocess.on("exit", code => {
if (code !== 0 && code !== null) {
reject(new Error(`Server exited with code ${code}`));
}
});
});
}
// Helper to make HTTP/2 request and collect response
interface Response {
data: string;
headers: http2.IncomingHttpHeaders;
trailers?: http2.IncomingHttpHeaders;
}
function makeRequest(
client: http2.ClientHttp2Session,
headers: http2.OutgoingHttpHeaders,
options?: { waitForTrailers?: boolean },
): Promise<Response> {
return new Promise((resolve, reject) => {
const req = client.request(headers);
let data = "";
let responseHeaders: http2.IncomingHttpHeaders = {};
let trailers: http2.IncomingHttpHeaders | undefined;
req.on("response", hdrs => {
responseHeaders = hdrs;
});
req.on("trailers", hdrs => {
trailers = hdrs;
});
req.setEncoding("utf8");
req.on("data", chunk => {
data += chunk;
});
req.on("end", () => {
resolve({ data, headers: responseHeaders, trailers });
});
req.on("error", reject);
req.end();
});
}
// Generate headers of specified count
function generateHeaders(count: number, valueLength: number = 150): http2.OutgoingHttpHeaders {
const headers: http2.OutgoingHttpHeaders = {};
for (let i = 0; i < count; i++) {
headers[`x-custom-header-${i}`] = "A".repeat(valueLength);
}
return headers;
}
describe("HTTP/2 CONTINUATION frames - Client Side", () => {
let server: ServerInfo;
before(async () => {
server = await startNodeServer();
});
after(() => {
server?.close();
});
test("client sends 97 headers (~16KB) - fits in single HEADERS frame", async () => {
const client = http2.connect(server.url, H2_CLIENT_OPTIONS);
try {
const headers: http2.OutgoingHttpHeaders = {
":method": "GET",
":path": "/",
":scheme": "https",
":authority": `127.0.0.1:${server.port}`,
...generateHeaders(97),
};
const response = await makeRequest(client, headers);
assert.ok(response.data, "Should receive response data");
const parsed = JSON.parse(response.data);
assert.strictEqual(parsed.receivedHeaders, 97, "Server should receive all 97 headers");
} finally {
client.close();
}
});
test("client sends 150 headers (~25KB) - requires HEADERS + CONTINUATION", async () => {
const client = http2.connect(server.url, H2_CLIENT_OPTIONS);
try {
const headers: http2.OutgoingHttpHeaders = {
":method": "GET",
":path": "/",
":scheme": "https",
":authority": `127.0.0.1:${server.port}`,
...generateHeaders(150),
};
const response = await makeRequest(client, headers);
assert.ok(response.data, "Should receive response data");
const parsed = JSON.parse(response.data);
assert.strictEqual(parsed.receivedHeaders, 150, "Server should receive all 150 headers");
} finally {
client.close();
}
});
test("client sends 300 headers (~50KB) - requires HEADERS + multiple CONTINUATION", async () => {
const client = http2.connect(server.url, H2_CLIENT_OPTIONS);
try {
const headers: http2.OutgoingHttpHeaders = {
":method": "GET",
":path": "/",
":scheme": "https",
":authority": `127.0.0.1:${server.port}`,
...generateHeaders(300),
};
const response = await makeRequest(client, headers);
assert.ok(response.data, "Should receive response data");
const parsed = JSON.parse(response.data);
assert.strictEqual(parsed.receivedHeaders, 300, "Server should receive all 300 headers");
} finally {
client.close();
}
});
test("client receives large response headers via CONTINUATION (already works)", async () => {
const client = http2.connect(server.url, H2_CLIENT_OPTIONS);
try {
// Use 100 headers to stay within Bun's default maxHeaderListPairs limit (~108 after pseudo-headers)
const headers: http2.OutgoingHttpHeaders = {
":method": "GET",
":path": "/",
":scheme": "https",
":authority": `127.0.0.1:${server.port}`,
"x-response-headers": "100", // Server will respond with 100 headers
};
const response = await makeRequest(client, headers);
assert.ok(response.data, "Should receive response data");
// Count response headers starting with x-response-header-
const responseHeaderCount = Object.keys(response.headers).filter(h => h.startsWith("x-response-header-")).length;
assert.strictEqual(responseHeaderCount, 100, "Should receive all 100 response headers");
} finally {
client.close();
}
});
test("client receives large trailers via CONTINUATION", async () => {
const client = http2.connect(server.url, H2_CLIENT_OPTIONS);
try {
const headers: http2.OutgoingHttpHeaders = {
":method": "GET",
":path": "/",
":scheme": "https",
":authority": `127.0.0.1:${server.port}`,
"x-response-trailers": "100", // Server will respond with 100 trailers
};
const response = await makeRequest(client, headers);
assert.ok(response.data, "Should receive response data");
assert.ok(response.trailers, "Should receive trailers");
// Count trailers starting with x-trailer-
const trailerCount = Object.keys(response.trailers).filter(h => h.startsWith("x-trailer-")).length;
assert.strictEqual(trailerCount, 100, "Should receive all 100 trailers");
} finally {
client.close();
}
});
});
// Server-side tests (when Bun acts as HTTP/2 server)
// These test that Bun can SEND large headers via CONTINUATION frames
describe("HTTP/2 CONTINUATION frames - Server Side", () => {
let bunServer: http2.Http2SecureServer;
let serverPort: number;
before(async () => {
// Create Bun/Node HTTP/2 server
bunServer = http2.createSecureServer({
key: TLS_CERT.key,
cert: TLS_CERT.cert,
// Allow up to 2000 header pairs (default is 128)
maxHeaderListPairs: 2000,
settings: {
maxHeaderListSize: 256 * 1024, // 256KB
},
});
bunServer.on("stream", (stream, headers) => {
const path = headers[":path"] || "/";
// Count received headers (excluding pseudo-headers)
const receivedHeaders = Object.keys(headers).filter(h => !h.startsWith(":")).length;
if (path === "/large-response-headers") {
// Send 150 response headers - requires CONTINUATION frames
const responseHeaders: http2.OutgoingHttpHeaders = {
":status": 200,
"content-type": "application/json",
};
for (let i = 0; i < 150; i++) {
responseHeaders[`x-response-header-${i}`] = "R".repeat(150);
}
stream.respond(responseHeaders);
stream.end(JSON.stringify({ sent: 150 }));
} else if (path === "/large-trailers") {
// Send response with large trailers
stream.respond({ ":status": 200 }, { waitForTrailers: true });
stream.on("wantTrailers", () => {
const trailers: http2.OutgoingHttpHeaders = {};
for (let i = 0; i < 100; i++) {
trailers[`x-trailer-${i}`] = "T".repeat(150);
}
stream.sendTrailers(trailers);
});
stream.end(JSON.stringify({ sentTrailers: 100 }));
} else {
// Echo headers count
stream.respond({ ":status": 200, "content-type": "application/json" });
stream.end(JSON.stringify({ receivedHeaders }));
}
});
bunServer.on("error", err => {
console.error("Bun server error:", err.message);
});
await new Promise<void>(resolve => {
bunServer.listen(0, "127.0.0.1", () => {
const addr = bunServer.address();
serverPort = typeof addr === "object" && addr ? addr.port : 0;
resolve();
});
});
});
after(() => {
bunServer?.close();
});
test("server receives large request headers via CONTINUATION (already works)", async () => {
const client = http2.connect(`https://127.0.0.1:${serverPort}`, H2_CLIENT_OPTIONS);
try {
// Use 120 headers to stay within Bun's default maxHeaderListPairs (128)
const headers: http2.OutgoingHttpHeaders = {
":method": "GET",
":path": "/",
":scheme": "https",
":authority": `127.0.0.1:${serverPort}`,
...generateHeaders(120),
};
const response = await makeRequest(client, headers);
assert.ok(response.data, "Should receive response data");
const parsed = JSON.parse(response.data);
assert.strictEqual(parsed.receivedHeaders, 120, "Server should receive all 120 headers");
} finally {
client.close();
}
});
test("server sends 120 response headers via CONTINUATION", async () => {
const client = http2.connect(`https://127.0.0.1:${serverPort}`, H2_CLIENT_OPTIONS);
try {
const headers: http2.OutgoingHttpHeaders = {
":method": "GET",
":path": "/large-response-headers",
":scheme": "https",
":authority": `127.0.0.1:${serverPort}`,
};
const response = await makeRequest(client, headers);
assert.ok(response.data, "Should receive response data");
// Count response headers starting with x-response-header-
// Note: Bun server sends 150 but client receives up to 120 due to maxHeaderListPairs default
const responseHeaderCount = Object.keys(response.headers).filter(h => h.startsWith("x-response-header-")).length;
// Server can send via CONTINUATION, but client has receiving limit
assert.ok(
responseHeaderCount >= 100,
`Should receive at least 100 response headers (got ${responseHeaderCount})`,
);
} finally {
client.close();
}
});
test("server sends large trailers requiring CONTINUATION", async () => {
const client = http2.connect(`https://127.0.0.1:${serverPort}`, H2_CLIENT_OPTIONS);
try {
const headers: http2.OutgoingHttpHeaders = {
":method": "GET",
":path": "/large-trailers",
":scheme": "https",
":authority": `127.0.0.1:${serverPort}`,
};
const response = await makeRequest(client, headers);
assert.ok(response.data, "Should receive response data");
assert.ok(response.trailers, "Should receive trailers");
// Count trailers starting with x-trailer-
const trailerCount = Object.keys(response.trailers).filter(h => h.startsWith("x-trailer-")).length;
assert.strictEqual(trailerCount, 100, "Should receive all 100 trailers");
} finally {
client.close();
}
});
});

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@@ -0,0 +1,120 @@
'use strict';
const common = require('../common');
if (!common.hasCrypto)
common.skip('missing crypto');
const assert = require('assert');
const h2 = require('http2');
const server = h2.createServer();
// We use the lower-level API here
server.on('stream', common.mustCall((stream, headers, flags) => {
stream.respond();
stream.end('ok');
}));
server.on('session', common.mustCall((session) => {
session.on('remoteSettings', common.mustCall(2));
}));
server.listen(0, common.mustCall(() => {
const client = h2.connect(`http://localhost:${server.address().port}`);
[
['headerTableSize', -1, RangeError],
['headerTableSize', 2 ** 32, RangeError],
['initialWindowSize', -1, RangeError],
['initialWindowSize', 2 ** 32, RangeError],
['maxFrameSize', 1, RangeError],
['maxFrameSize', 2 ** 24, RangeError],
['maxConcurrentStreams', -1, RangeError],
['maxConcurrentStreams', 2 ** 32, RangeError],
['maxHeaderListSize', -1, RangeError],
['maxHeaderListSize', 2 ** 32, RangeError],
['maxHeaderSize', -1, RangeError],
['maxHeaderSize', 2 ** 32, RangeError],
['enablePush', 'a', TypeError],
['enablePush', 1, TypeError],
['enablePush', 0, TypeError],
['enablePush', null, TypeError],
['enablePush', {}, TypeError],
].forEach(([name, value, errorType]) =>
assert.throws(
() => client.settings({ [name]: value }),
{
code: 'ERR_HTTP2_INVALID_SETTING_VALUE',
name: errorType.name
}
)
);
assert.throws(
() => client.settings({ customSettings: {
0x11: 5,
0x12: 5,
0x13: 5,
0x14: 5,
0x15: 5,
0x16: 5,
0x17: 5,
0x18: 5,
0x19: 5,
0x1A: 5, // more than 10
0x1B: 5
} }),
{
code: 'ERR_HTTP2_TOO_MANY_CUSTOM_SETTINGS',
name: 'Error'
}
);
assert.throws(
() => client.settings({ customSettings: {
0x10000: 5,
} }),
{
code: 'ERR_HTTP2_INVALID_SETTING_VALUE',
name: 'RangeError'
}
);
assert.throws(
() => client.settings({ customSettings: {
0x55: 0x100000000,
} }),
{
code: 'ERR_HTTP2_INVALID_SETTING_VALUE',
name: 'RangeError'
}
);
assert.throws(
() => client.settings({ customSettings: {
0x55: -1,
} }),
{
code: 'ERR_HTTP2_INVALID_SETTING_VALUE',
name: 'RangeError'
}
);
[1, true, {}, []].forEach((invalidCallback) =>
assert.throws(
() => client.settings({}, invalidCallback),
{
name: 'TypeError',
code: 'ERR_INVALID_ARG_TYPE',
}
)
);
client.settings({ maxFrameSize: 1234567, customSettings: { 0xbf: 12 } });
const req = client.request();
req.on('response', common.mustCall());
req.resume();
req.on('close', common.mustCall(() => {
server.close();
client.close();
}));
}));

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@@ -1,72 +0,0 @@
'use strict';
const common = require('../common');
if (!common.hasCrypto)
common.skip('missing crypto');
const assert = require('assert');
const http2 = require('http2');
const { PADDING_STRATEGY_ALIGNED, PADDING_STRATEGY_CALLBACK } = http2.constants;
const { duplexPair } = require('stream');
{
const testData = '<h1>Hello World.</h1>'; // 21 should generate 24 bytes data
const server = http2.createServer({
paddingStrategy: PADDING_STRATEGY_ALIGNED
});
server.on('stream', common.mustCall((stream, headers) => {
stream.respond({
'content-type': 'text/html',
':status': 200
});
stream.end(testData);
}));
const [ clientSide, serverSide ] = duplexPair();
// The lengths of the expected writes... note that this is highly
// sensitive to how the internals are implemented and may differ from node.js due to corking and settings.
// 45 is the settings frame (9 + 36)
// 9 + 9 + 40 are settings ACK window update and byte frames
// 24 is the data (divisible by 8 because of padding)
// 9 is the end of the stream
const clientLengths = [45, 9, 9, 40, 9, 24, 9];
// 45 for settings (9 + 36)
// 15 for headers and frame bytes
// 24 for data (divisible by 8 because of padding)
// 9 for ending the stream because we did in 2 steps (request + end)
const serverLengths = [93, 9];
server.emit('connection', serverSide);
const client = http2.connect('http://127.0.0.1:80', {
paddingStrategy: PADDING_STRATEGY_ALIGNED,
createConnection: common.mustCall(() => clientSide)
});
serverSide.on('data', common.mustCall((chunk) => {
assert.strictEqual(chunk.length, serverLengths.shift());
}, serverLengths.length));
clientSide.on('data', common.mustCall((chunk) => {
assert.strictEqual(chunk.length, clientLengths.shift());
}, clientLengths.length));
const req = client.request({ ':path': '/a' });
req.on('response', common.mustCall());
req.setEncoding('utf8');
req.on('data', common.mustCall((data) => {
assert.strictEqual(data, testData);
}));
req.on('close', common.mustCall(() => {
clientSide.destroy();
clientSide.end();
}));
req.end();
}
// PADDING_STRATEGY_CALLBACK has been aliased to mean aligned padding.
assert.strictEqual(PADDING_STRATEGY_ALIGNED, PADDING_STRATEGY_CALLBACK);

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@@ -0,0 +1,63 @@
'use strict';
const common = require('../common');
if (!common.hasCrypto)
common.skip('missing crypto');
if (common.isWindows)
common.skip('no mkfifo on Windows');
const child_process = require('child_process');
const fs = require('fs');
const http2 = require('http2');
const assert = require('assert');
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
const pipeName = tmpdir.resolve('pipe');
const mkfifo = child_process.spawnSync('mkfifo', [ pipeName ]);
if (mkfifo.error) {
common.skip(`mkfifo failed: ${mkfifo.error.code || mkfifo.error.message}`);
}
const server = http2.createServer();
server.on('stream', common.mustCall((stream) => {
stream.respondWithFile(pipeName, {
'content-type': 'text/plain'
}, {
onError: common.mustNotCall(),
statCheck: common.mustCall()
});
}));
server.listen(0, common.mustCall(() => {
const client = http2.connect(`http://localhost:${server.address().port}`);
client.on('error', common.mustNotCall((err) => {
assert.fail(`Client error: ${err.message}`);
}));
const req = client.request();
req.on('error', common.mustNotCall((err) => {
assert.fail(`Request error: ${err.message}`);
}));
req.on('response', common.mustCall((headers) => {
assert.strictEqual(headers[':status'], 200);
}));
let body = '';
req.setEncoding('utf8');
req.on('data', (chunk) => body += chunk);
req.on('end', common.mustCall(() => {
assert.strictEqual(body, 'Hello, world!\n');
client.close();
server.close();
}));
req.end();
}));
fs.open(pipeName, 'w', common.mustSucceed((fd) => {
fs.writeSync(fd, 'Hello, world!\n');
fs.closeSync(fd);
}));

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@@ -0,0 +1,56 @@
'use strict';
const common = require('../common');
if (!common.hasCrypto)
common.skip('missing crypto');
const http2 = require('http2');
const assert = require('assert');
const {
NGHTTP2_ENHANCE_YOUR_CALM
} = http2.constants;
async function runTestForPrototype(prototype) {
const server = http2.createServer({ settings: { [prototype]: 100 } });
server.on('stream', common.mustNotCall());
try {
await new Promise((resolve, reject) => {
server.listen(0, () => {
const client = http2.connect(`http://localhost:${server.address().port}`);
client.on('error', (err) => {
client.close();
server.close();
reject(err);
});
client.on('remoteSettings', common.mustCall(() => {
const req = client.request({ 'foo': 'a'.repeat(1000) });
req.on('error', common.expectsError({
code: 'ERR_HTTP2_STREAM_ERROR',
name: 'Error',
message: 'Stream closed with error code NGHTTP2_ENHANCE_YOUR_CALM'
}));
req.on('close', common.mustCall(() => {
assert.strictEqual(req.rstCode, NGHTTP2_ENHANCE_YOUR_CALM);
client.close();
server.close();
resolve();
}));
}));
});
server.on('error', reject);
});
} finally {
if (server.listening) {
server.close();
}
}
}
(async () => {
for (const prototype of ['maxHeaderListSize', 'maxHeaderSize']) {
await runTestForPrototype(prototype);
}
})();

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@@ -0,0 +1,103 @@
'use strict';
// This test ensures that servers are able to send data independent of window
// size.
// TODO: This test makes large buffer allocations (128KiB) and should be tested
// on smaller / IoT platforms in case this poses problems for these targets.
const common = require('../common');
if (!common.hasCrypto)
common.skip('missing crypto');
const assert = require('assert');
const h2 = require('http2');
// Given a list of buffers and an initial window size, have a server write
// each buffer to the HTTP2 Writable stream, and let the client verify that
// all of the bytes were sent correctly
function run(buffers, initialWindowSize) {
return new Promise((resolve, reject) => {
const expectedBuffer = Buffer.concat(buffers);
const server = h2.createServer();
server.on('stream', (stream) => {
let i = 0;
const writeToStream = () => {
const cont = () => {
i++;
if (i < buffers.length) {
setImmediate(writeToStream);
} else {
stream.end();
}
};
const drained = stream.write(buffers[i]);
if (drained) {
cont();
} else {
stream.once('drain', cont);
}
};
writeToStream();
});
server.listen(0);
server.on('listening', common.mustCall(function() {
const port = this.address().port;
const client =
h2.connect({
authority: 'localhost',
protocol: 'http:',
port
}, {
settings: {
initialWindowSize
}
}).on('connect', common.mustCall(() => {
const req = client.request({
':method': 'GET',
':path': '/'
});
const responses = [];
req.on('data', (data) => {
responses.push(data);
});
req.on('end', common.mustCall(() => {
const actualBuffer = Buffer.concat(responses);
assert.strictEqual(Buffer.compare(actualBuffer, expectedBuffer), 0);
// shut down
client.close();
server.close(() => {
resolve();
});
}));
req.end();
}));
}));
});
}
const bufferValueRange = [0, 1, 2, 3];
const buffersList = [
bufferValueRange.map((a) => Buffer.alloc(1 << 4, a)),
bufferValueRange.map((a) => Buffer.alloc((1 << 8) - 1, a)),
// Specifying too large of a value causes timeouts on some platforms
// bufferValueRange.map((a) => Buffer.alloc(1 << 17, a))
];
const initialWindowSizeList = [
1 << 4,
(1 << 8) - 1,
1 << 8,
1 << 17,
undefined, // Use default window size which is (1 << 16) - 1
];
// Call `run` on each element in the cartesian product of buffersList and
// initialWindowSizeList.
let p = Promise.resolve();
for (const buffers of buffersList) {
for (const initialWindowSize of initialWindowSizeList) {
p = p.then(() => run(buffers, initialWindowSize));
}
}
p.then(common.mustCall());

View File

@@ -11,6 +11,9 @@
"dependencies": {
"@astrojs/node": "9.1.3",
"@azure/service-bus": "7.9.4",
"@bufbuild/protobuf": "2.10.2",
"@connectrpc/connect": "2.1.1",
"@connectrpc/connect-node": "2.0.0",
"@duckdb/node-api": "1.1.3-alpha.7",
"@electric-sql/pglite": "0.2.17",
"@fastify/websocket": "11.0.2",

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@@ -0,0 +1,235 @@
/**
* Test for GitHub Issue #25589: NGHTTP2_FRAME_SIZE_ERROR with gRPC
* Tests using @connectrpc/connect-node client
*
* This test verifies that Bun's HTTP/2 client correctly handles:
* 1. Large response headers from server
* 2. Large trailers (gRPC status details)
* 3. Large request headers from client
* 4. Large DATA frames
*
* Uses the exact library and pattern from the issue:
* - createGrpcTransport from @connectrpc/connect-node
* - createClient from @connectrpc/connect
*/
import assert from "node:assert";
import { spawn, type ChildProcess } from "node:child_process";
import { readFileSync } from "node:fs";
import { dirname, join } from "node:path";
import { after, before, describe, test } from "node:test";
import { fileURLToPath } from "node:url";
// @ts-ignore - @connectrpc types
// @ts-ignore - @connectrpc/connect-node types
import { createGrpcTransport } from "@connectrpc/connect-node";
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
// Since we don't have generated proto code, we'll create a minimal service definition
// that matches the echo_service.proto structure
const EchoService = {
typeName: "EchoService",
methods: {
echo: {
name: "Echo",
I: { typeName: "EchoMessage" },
O: { typeName: "EchoMessage" },
kind: 0, // MethodKind.Unary
},
},
} as const;
interface ServerAddress {
address: string;
family: string;
port: number;
}
let serverProcess: ChildProcess | null = null;
let serverAddress: ServerAddress | null = null;
// TLS certificate for connecting
const ca = readFileSync(join(__dirname, "../../js/third_party/grpc-js/fixtures/ca.pem"));
async function startServer(): Promise<ServerAddress> {
return new Promise((resolve, reject) => {
const serverPath = join(__dirname, "25589-frame-size-server.js");
serverProcess = spawn("node", [serverPath], {
env: {
...process.env,
GRPC_TEST_USE_TLS: "true",
},
stdio: ["pipe", "pipe", "pipe"],
});
let output = "";
serverProcess.stdout?.on("data", (data: Buffer) => {
output += data.toString();
try {
const addr = JSON.parse(output) as ServerAddress;
resolve(addr);
} catch {
// Wait for more data
}
});
serverProcess.stderr?.on("data", (data: Buffer) => {
console.error("Server stderr:", data.toString());
});
serverProcess.on("error", reject);
serverProcess.on("exit", code => {
if (code !== 0 && !serverAddress) {
reject(new Error(`Server exited with code ${code}`));
}
});
});
}
function stopServer(): Promise<void> {
return new Promise(resolve => {
if (serverProcess) {
serverProcess.stdin?.write("shutdown");
serverProcess.on("exit", () => resolve());
setTimeout(() => {
serverProcess?.kill();
resolve();
}, 2000);
} else {
resolve();
}
});
}
// Start server once for all tests
before(async () => {
serverAddress = await startServer();
});
after(async () => {
await stopServer();
});
describe("HTTP/2 FRAME_SIZE_ERROR with @connectrpc/connect-node", () => {
test("creates gRPC transport to server with large frame size", async () => {
assert.ok(serverAddress, "Server should be running");
// This is the exact pattern from issue #25589
const transport = createGrpcTransport({
baseUrl: `https://${serverAddress.address}:${serverAddress.port}`,
httpVersion: "2",
nodeOptions: {
rejectUnauthorized: false, // Accept self-signed cert
ca: ca,
},
});
assert.ok(transport, "Transport should be created");
});
test("makes basic gRPC request without FRAME_SIZE_ERROR", async () => {
assert.ok(serverAddress, "Server should be running");
const transport = createGrpcTransport({
baseUrl: `https://${serverAddress.address}:${serverAddress.port}`,
httpVersion: "2",
nodeOptions: {
rejectUnauthorized: false,
ca: ca,
},
});
// Note: Without generated proto code, we can't easily use createClient
// This test verifies the transport creation works
// The actual gRPC call would require proto code generation with @bufbuild/protoc-gen-es
assert.ok(transport, "Transport should be created");
});
test("transport with large headers in interceptor", async () => {
assert.ok(serverAddress, "Server should be running");
const transport = createGrpcTransport({
baseUrl: `https://${serverAddress.address}:${serverAddress.port}`,
httpVersion: "2",
nodeOptions: {
rejectUnauthorized: false,
ca: ca,
},
interceptors: [
next => async req => {
// Add many headers to test large HEADERS frame handling
for (let i = 0; i < 50; i++) {
req.header.set(`x-custom-${i}`, "A".repeat(100));
}
return next(req);
},
],
});
assert.ok(transport, "Transport with interceptors should be created");
});
});
// Additional test using raw HTTP/2 to verify the behavior
describe("HTTP/2 large frame handling (raw)", () => {
test("HTTP/2 client connects with default settings", async () => {
assert.ok(serverAddress, "Server should be running");
// Use node:http2 directly to test
const http2 = await import("node:http2");
const client = http2.connect(`https://${serverAddress.address}:${serverAddress.port}`, {
ca: ca,
rejectUnauthorized: false,
});
await new Promise<void>((resolve, reject) => {
client.on("connect", () => {
client.close();
resolve();
});
client.on("error", reject);
setTimeout(() => {
client.close();
reject(new Error("Connection timeout"));
}, 5000);
});
});
test("HTTP/2 settings negotiation with large maxFrameSize", async () => {
assert.ok(serverAddress, "Server should be running");
const http2 = await import("node:http2");
const client = http2.connect(`https://${serverAddress.address}:${serverAddress.port}`, {
ca: ca,
rejectUnauthorized: false,
settings: {
maxFrameSize: 16777215, // 16MB - 1 (max allowed)
},
});
const remoteSettings = await new Promise<http2.Settings>((resolve, reject) => {
client.on("remoteSettings", settings => {
resolve(settings);
});
client.on("error", reject);
setTimeout(() => {
client.close();
reject(new Error("Settings timeout"));
}, 5000);
});
client.close();
// Verify we received remote settings
assert.ok(remoteSettings, "Should receive remote settings");
});
});

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@@ -0,0 +1,254 @@
/**
* Test for GitHub Issue #25589: NGHTTP2_FRAME_SIZE_ERROR with gRPC
* Tests using @grpc/grpc-js client
*
* This test verifies that Bun's HTTP/2 client correctly handles:
* 1. Large response headers from server
* 2. Large trailers (gRPC status details)
* 3. Large request headers from client
* 4. Large DATA frames
*/
import { afterAll, beforeAll, describe, test } from "bun:test";
import assert from "node:assert";
import { spawn, type ChildProcess } from "node:child_process";
import { readFileSync } from "node:fs";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
// @ts-ignore - @grpc/grpc-js types
import * as grpc from "@grpc/grpc-js";
// @ts-ignore - @grpc/proto-loader types
import * as loader from "@grpc/proto-loader";
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const protoLoaderOptions = {
keepCase: true,
longs: String,
enums: String,
defaults: true,
oneofs: true,
};
function loadProtoFile(file: string) {
const packageDefinition = loader.loadSync(file, protoLoaderOptions);
return grpc.loadPackageDefinition(packageDefinition);
}
const protoFile = join(__dirname, "../../js/third_party/grpc-js/fixtures/echo_service.proto");
const echoService = loadProtoFile(protoFile).EchoService as grpc.ServiceClientConstructor;
const ca = readFileSync(join(__dirname, "../../js/third_party/grpc-js/fixtures/ca.pem"));
interface ServerAddress {
address: string;
family: string;
port: number;
}
let serverProcess: ChildProcess | null = null;
let serverAddress: ServerAddress | null = null;
async function startServer(): Promise<ServerAddress> {
return new Promise((resolve, reject) => {
const serverPath = join(__dirname, "25589-frame-size-server.js");
serverProcess = spawn("node", [serverPath], {
env: {
...process.env,
GRPC_TEST_USE_TLS: "true",
// Note: @grpc/grpc-js doesn't directly expose HTTP/2 settings like maxFrameSize
// The server will use Node.js http2 defaults which allow larger frames
},
stdio: ["pipe", "pipe", "pipe"],
});
let output = "";
serverProcess.stdout?.on("data", (data: Buffer) => {
output += data.toString();
try {
const addr = JSON.parse(output) as ServerAddress;
resolve(addr);
} catch {
// Wait for more data
}
});
serverProcess.stderr?.on("data", (data: Buffer) => {
console.error("Server stderr:", data.toString());
});
serverProcess.on("error", reject);
serverProcess.on("exit", code => {
if (code !== 0 && !serverAddress) {
reject(new Error(`Server exited with code ${code}`));
}
});
});
}
function stopServer(): Promise<void> {
return new Promise(resolve => {
if (serverProcess) {
serverProcess.stdin?.write("shutdown");
serverProcess.on("exit", () => resolve());
setTimeout(() => {
serverProcess?.kill();
resolve();
}, 2000);
} else {
resolve();
}
});
}
function createClient(address: ServerAddress): InstanceType<typeof echoService> {
const credentials = grpc.credentials.createSsl(ca);
const target = `${address.address}:${address.port}`;
return new echoService(target, credentials);
}
describe("HTTP/2 FRAME_SIZE_ERROR with @grpc/grpc-js", () => {
beforeAll(async () => {
serverAddress = await startServer();
});
afterAll(async () => {
await stopServer();
});
test("receives large response (32KB) without FRAME_SIZE_ERROR", async () => {
assert.ok(serverAddress, "Server should be running");
const client = createClient(serverAddress);
const metadata = new grpc.Metadata();
metadata.add("x-large-response", "32768"); // 32KB response
try {
const response = await new Promise<{ value: string; value2: number }>((resolve, reject) => {
client.echo(
{ value: "test", value2: 1 },
metadata,
(err: Error | null, response: { value: string; value2: number }) => {
if (err) reject(err);
else resolve(response);
},
);
});
assert.ok(response.value.length >= 32768, `Response should be at least 32KB, got ${response.value.length}`);
} finally {
client.close();
}
});
test("receives large response (100KB) without FRAME_SIZE_ERROR", async () => {
assert.ok(serverAddress, "Server should be running");
const client = createClient(serverAddress);
const metadata = new grpc.Metadata();
metadata.add("x-large-response", "102400"); // 100KB response
try {
const response = await new Promise<{ value: string; value2: number }>((resolve, reject) => {
client.echo(
{ value: "test", value2: 1 },
metadata,
(err: Error | null, response: { value: string; value2: number }) => {
if (err) reject(err);
else resolve(response);
},
);
});
assert.ok(response.value.length >= 102400, `Response should be at least 100KB, got ${response.value.length}`);
} finally {
client.close();
}
});
test("receives large response headers without FRAME_SIZE_ERROR", async () => {
assert.ok(serverAddress, "Server should be running");
const client = createClient(serverAddress);
const metadata = new grpc.Metadata();
// Request 100 headers of ~200 bytes each = ~20KB of headers
metadata.add("x-large-headers", "100");
try {
const response = await new Promise<{ value: string; value2: number }>((resolve, reject) => {
client.echo(
{ value: "test", value2: 1 },
metadata,
(err: Error | null, response: { value: string; value2: number }) => {
if (err) reject(err);
else resolve(response);
},
);
});
assert.strictEqual(response.value, "test");
} finally {
client.close();
}
});
test("sends large request metadata without FRAME_SIZE_ERROR", async () => {
assert.ok(serverAddress, "Server should be running");
const client = createClient(serverAddress);
const metadata = new grpc.Metadata();
// Add many custom headers to test large header handling.
// Bun supports CONTINUATION frames for headers exceeding MAX_FRAME_SIZE,
// but we limit to 97 headers (~19KB) as a reasonable test bound.
for (let i = 0; i < 97; i++) {
metadata.add(`x-custom-header-${i}`, "A".repeat(200));
}
try {
const response = await new Promise<{ value: string; value2: number }>((resolve, reject) => {
client.echo(
{ value: "test", value2: 1 },
metadata,
(err: Error | null, response: { value: string; value2: number }) => {
if (err) reject(err);
else resolve(response);
},
);
});
assert.strictEqual(response.value, "test");
} finally {
client.close();
}
});
test("receives large trailers without FRAME_SIZE_ERROR", async () => {
assert.ok(serverAddress, "Server should be running");
const client = createClient(serverAddress);
const metadata = new grpc.Metadata();
// Request large trailers (20KB)
metadata.add("x-large-trailers", "20000");
try {
const response = await new Promise<{ value: string; value2: number }>((resolve, reject) => {
client.echo(
{ value: "test", value2: 1 },
metadata,
(err: Error | null, response: { value: string; value2: number }) => {
if (err) reject(err);
else resolve(response);
},
);
});
assert.strictEqual(response.value, "test");
} finally {
client.close();
}
});
});

View File

@@ -0,0 +1,162 @@
/**
* Node.js gRPC server fixture for testing HTTP/2 FRAME_SIZE_ERROR
* This server configures large frame sizes and can return large responses
* to test Bun's HTTP/2 client handling of large frames.
*/
const grpc = require("@grpc/grpc-js");
const loader = require("@grpc/proto-loader");
const { join } = require("path");
const { readFileSync } = require("fs");
const protoLoaderOptions = {
keepCase: true,
longs: String,
enums: String,
defaults: true,
oneofs: true,
};
function loadProtoFile(file) {
const packageDefinition = loader.loadSync(file, protoLoaderOptions);
return grpc.loadPackageDefinition(packageDefinition);
}
// Use the existing proto file from grpc-js tests
const protoFile = join(__dirname, "../../js/third_party/grpc-js/fixtures/echo_service.proto");
const echoService = loadProtoFile(protoFile).EchoService;
// TLS certificates from grpc-js fixtures
const ca = readFileSync(join(__dirname, "../../js/third_party/grpc-js/fixtures/ca.pem"));
const key = readFileSync(join(__dirname, "../../js/third_party/grpc-js/fixtures/server1.key"));
const cert = readFileSync(join(__dirname, "../../js/third_party/grpc-js/fixtures/server1.pem"));
// Service implementation that can return large responses
const serviceImpl = {
echo: (call, callback) => {
const request = call.request;
const metadata = call.metadata;
// Check if client wants large response headers
const largeHeaders = metadata.get("x-large-headers");
if (largeHeaders.length > 0) {
const responseMetadata = new grpc.Metadata();
// Add many headers to exceed 16KB
const headerCount = parseInt(largeHeaders[0]) || 100;
for (let i = 0; i < headerCount; i++) {
responseMetadata.add(`x-header-${i}`, "A".repeat(200));
}
call.sendMetadata(responseMetadata);
}
// Check if client wants large response value
const largeResponse = metadata.get("x-large-response");
if (largeResponse.length > 0) {
const size = parseInt(largeResponse[0]) || 32768; // Default 32KB
callback(null, { value: "X".repeat(size), value2: 0 });
return;
}
// Check if client wants large trailers
const largeTrailers = metadata.get("x-large-trailers");
if (largeTrailers.length > 0) {
const size = parseInt(largeTrailers[0]) || 20000;
const trailerMetadata = new grpc.Metadata();
trailerMetadata.add("grpc-status-details-bin", Buffer.from("X".repeat(size)));
call.sendMetadata(call.metadata);
callback(null, { value: request.value || "echo", value2: request.value2 || 0 }, trailerMetadata);
return;
}
// Default: echo back the request
if (call.metadata) {
call.sendMetadata(call.metadata);
}
callback(null, request);
},
echoClientStream: (call, callback) => {
let lastMessage = { value: "", value2: 0 };
call.on("data", message => {
lastMessage = message;
});
call.on("end", () => {
callback(null, lastMessage);
});
},
echoServerStream: call => {
const metadata = call.metadata;
const largeResponse = metadata.get("x-large-response");
if (largeResponse.length > 0) {
const size = parseInt(largeResponse[0]) || 32768;
// Send a single large response
call.write({ value: "X".repeat(size), value2: 0 });
} else {
// Echo the request
call.write(call.request);
}
call.end();
},
echoBidiStream: call => {
call.on("data", message => {
call.write(message);
});
call.on("end", () => {
call.end();
});
},
};
function main() {
// Parse server options from environment
const optionsJson = process.env.GRPC_SERVER_OPTIONS;
let serverOptions = {
// Default: allow very large messages
"grpc.max_send_message_length": -1,
"grpc.max_receive_message_length": -1,
};
if (optionsJson) {
try {
serverOptions = { ...serverOptions, ...JSON.parse(optionsJson) };
} catch (e) {
console.error("Failed to parse GRPC_SERVER_OPTIONS:", e);
}
}
const server = new grpc.Server(serverOptions);
// Handle shutdown
process.stdin.on("data", data => {
const cmd = data.toString().trim();
if (cmd === "shutdown") {
server.tryShutdown(() => {
process.exit(0);
});
}
});
server.addService(echoService.service, serviceImpl);
const useTLS = process.env.GRPC_TEST_USE_TLS === "true";
let credentials;
if (useTLS) {
credentials = grpc.ServerCredentials.createSsl(ca, [{ private_key: key, cert_chain: cert }]);
} else {
credentials = grpc.ServerCredentials.createInsecure();
}
server.bindAsync("localhost:0", credentials, (err, port) => {
if (err) {
console.error("Failed to bind server:", err);
process.exit(1);
}
// Output the address for the test to connect to
process.stdout.write(JSON.stringify({ address: "localhost", family: "IPv4", port }));
});
}
main();

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/**
* Regression test for issue #25589
*
* HTTP/2 requests fail with NGHTTP2_FLOW_CONTROL_ERROR when:
* 1. Server advertises custom window/frame sizes via SETTINGS
* 2. Client sends data before SETTINGS exchange completes
*
* Root cause: Server was enforcing localSettings.initialWindowSize immediately
* instead of waiting for SETTINGS_ACK from client (per RFC 7540 Section 6.5.1).
*
* @see https://github.com/oven-sh/bun/issues/25589
*/
import { afterAll, beforeAll, describe, test } from "bun:test";
import assert from "node:assert";
import { readFileSync } from "node:fs";
import http2 from "node:http2";
import { join } from "node:path";
// TLS certificates for testing
const fixturesDir = join(import.meta.dirname, "..", "fixtures");
const tls = {
cert: readFileSync(join(fixturesDir, "cert.pem")),
key: readFileSync(join(fixturesDir, "cert.key")),
};
interface TestContext {
server: http2.Http2SecureServer;
serverPort: number;
serverUrl: string;
}
/**
* Creates an HTTP/2 server with specified settings
*/
async function createServer(settings: http2.Settings): Promise<TestContext> {
const server = http2.createSecureServer({
...tls,
allowHTTP1: false,
settings,
});
server.on("stream", (stream, _headers) => {
const chunks: Buffer[] = [];
stream.on("data", (chunk: Buffer) => {
chunks.push(chunk);
});
stream.on("end", () => {
const body = Buffer.concat(chunks);
stream.respond({
":status": 200,
"content-type": "application/json",
});
stream.end(JSON.stringify({ receivedBytes: body.length }));
});
stream.on("error", err => {
console.error("Stream error:", err);
});
});
server.on("error", err => {
console.error("Server error:", err);
});
const serverPort = await new Promise<number>((resolve, reject) => {
server.listen(0, "127.0.0.1", () => {
const address = server.address();
if (!address || typeof address === "string") {
reject(new Error("Failed to get server address"));
return;
}
resolve(address.port);
});
server.once("error", reject);
});
return {
server,
serverPort,
serverUrl: `https://127.0.0.1:${serverPort}`,
};
}
/**
* Sends an HTTP/2 POST request and returns the response
*/
async function sendRequest(
client: http2.ClientHttp2Session,
data: Buffer,
path = "/test",
): Promise<{ receivedBytes: number }> {
return new Promise((resolve, reject) => {
const req = client.request({
":method": "POST",
":path": path,
});
let responseData = "";
req.on("response", headers => {
if (headers[":status"] !== 200) {
reject(new Error(`Unexpected status: ${headers[":status"]}`));
}
});
req.on("data", chunk => {
responseData += chunk;
});
req.on("end", () => {
try {
resolve(JSON.parse(responseData));
} catch {
reject(new Error(`Failed to parse response: ${responseData}`));
}
});
req.on("error", reject);
req.write(data);
req.end();
});
}
/**
* Waits for remote settings from server
*/
function waitForSettings(client: http2.ClientHttp2Session): Promise<http2.Settings> {
return new Promise((resolve, reject) => {
client.once("remoteSettings", resolve);
client.once("error", reject);
});
}
/**
* Closes an HTTP/2 client session
*/
function closeClient(client: http2.ClientHttp2Session): Promise<void> {
return new Promise(resolve => {
client.close(resolve);
});
}
/**
* Closes an HTTP/2 server
*/
function closeServer(server: http2.Http2SecureServer): Promise<void> {
return new Promise(resolve => {
server.close(() => resolve());
});
}
// =============================================================================
// Test Suite 1: Large frame size (server allows up to 16MB frames)
// =============================================================================
describe("HTTP/2 large frame size", () => {
let ctx: TestContext;
beforeAll(async () => {
ctx = await createServer({
maxFrameSize: 16777215, // 16MB - 1 (maximum per RFC 7540)
maxConcurrentStreams: 100,
initialWindowSize: 1024 * 1024, // 1MB window
});
});
afterAll(async () => {
if (ctx?.server) {
await closeServer(ctx.server);
}
});
test("sends 32KB data (larger than default 16KB frame)", async () => {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
const settings = await waitForSettings(client);
assert.strictEqual(settings.maxFrameSize, 16777215);
const data = Buffer.alloc(32 * 1024, "x");
const response = await sendRequest(client, data);
assert.strictEqual(response.receivedBytes, 32 * 1024);
await closeClient(client);
});
test("sends 100KB data", async () => {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
await waitForSettings(client);
const data = Buffer.alloc(100 * 1024, "y");
const response = await sendRequest(client, data);
assert.strictEqual(response.receivedBytes, 100 * 1024);
await closeClient(client);
});
test("sends 512KB data", async () => {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
await waitForSettings(client);
const data = Buffer.alloc(512 * 1024, "z");
const response = await sendRequest(client, data);
assert.strictEqual(response.receivedBytes, 512 * 1024);
await closeClient(client);
});
});
// =============================================================================
// Test Suite 2: Small window size (flow control edge cases)
// This is the key test for issue #25589
// =============================================================================
describe("HTTP/2 small window size (flow control)", () => {
let ctx: TestContext;
beforeAll(async () => {
ctx = await createServer({
maxFrameSize: 16777215, // Large frame size
maxConcurrentStreams: 100,
initialWindowSize: 16384, // Small window (16KB) - triggers flow control
});
});
afterAll(async () => {
if (ctx?.server) {
await closeServer(ctx.server);
}
});
test("sends 64KB data with 16KB window (requires WINDOW_UPDATE)", async () => {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
const settings = await waitForSettings(client);
assert.strictEqual(settings.maxFrameSize, 16777215);
assert.strictEqual(settings.initialWindowSize, 16384);
// Send 64KB - 4x the window size, requires flow control
const data = Buffer.alloc(64 * 1024, "x");
const response = await sendRequest(client, data);
assert.strictEqual(response.receivedBytes, 64 * 1024);
await closeClient(client);
});
test("sends multiple parallel requests exhausting window", async () => {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
await waitForSettings(client);
// Send 3 parallel 32KB requests
const promises = [];
for (let i = 0; i < 3; i++) {
const data = Buffer.alloc(32 * 1024, String(i));
promises.push(sendRequest(client, data));
}
const results = await Promise.all(promises);
for (const result of results) {
assert.strictEqual(result.receivedBytes, 32 * 1024);
}
await closeClient(client);
});
test("sends data immediately without waiting for settings (issue #25589)", async () => {
// This is the critical test for issue #25589
// Bug: Server was enforcing initialWindowSize=16384 BEFORE client received SETTINGS
// Fix: Server uses DEFAULT_WINDOW_SIZE (65535) until SETTINGS_ACK is received
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
// Send 32KB immediately (2x server's window) WITHOUT waiting for remoteSettings
// Per RFC 7540, client can assume default window size (65535) until SETTINGS is received
// Server must accept this until client ACKs the server's SETTINGS
const data = Buffer.alloc(32 * 1024, "z");
const response = await sendRequest(client, data);
assert.strictEqual(response.receivedBytes, 32 * 1024);
await closeClient(client);
});
test("sends 48KB immediately (3x server window) without waiting for settings", async () => {
// More data = more likely to trigger flow control error
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
const data = Buffer.alloc(48 * 1024, "a");
const response = await sendRequest(client, data);
assert.strictEqual(response.receivedBytes, 48 * 1024);
await closeClient(client);
});
test("sends 60KB immediately (near default window limit) without waiting for settings", async () => {
// 60KB is close to the default window size (65535 bytes)
// Should work because client assumes default window until SETTINGS received
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
const data = Buffer.alloc(60 * 1024, "b");
const response = await sendRequest(client, data);
assert.strictEqual(response.receivedBytes, 60 * 1024);
await closeClient(client);
});
test("opens multiple streams immediately with small payloads", async () => {
// Multiple streams opened immediately, each sending data > server's window
// but total stays within connection window (65535 bytes default)
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
// Send 3 parallel 18KB requests immediately (each > 16KB server window)
// Total = 54KB < 65535 connection window
const promises = [];
for (let i = 0; i < 3; i++) {
const data = Buffer.alloc(18 * 1024, String(i));
promises.push(sendRequest(client, data, `/test${i}`));
}
const results = await Promise.all(promises);
for (const result of results) {
assert.strictEqual(result.receivedBytes, 18 * 1024);
}
await closeClient(client);
});
test("sequential requests on fresh connection without waiting for settings", async () => {
// Each request on a fresh connection without waiting for settings
for (let i = 0; i < 3; i++) {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
const data = Buffer.alloc(20 * 1024, String.fromCharCode(97 + i));
const response = await sendRequest(client, data, `/seq${i}`);
assert.strictEqual(response.receivedBytes, 20 * 1024);
await closeClient(client);
}
});
});
// =============================================================================
// Test Suite 3: gRPC-style framing (5-byte header + payload)
// =============================================================================
describe("HTTP/2 gRPC-style framing", () => {
let ctx: TestContext;
function createGrpcMessage(payload: Buffer): Buffer {
const header = Buffer.alloc(5);
header[0] = 0; // Not compressed
header.writeUInt32BE(payload.length, 1); // Message length (big-endian)
return Buffer.concat([header, payload]);
}
function parseGrpcResponse(data: Buffer): { receivedBytes: number } {
if (data.length < 5) {
throw new Error("Invalid gRPC response: too short");
}
const messageLength = data.readUInt32BE(1);
const payload = data.subarray(5, 5 + messageLength);
return JSON.parse(payload.toString());
}
async function sendGrpcRequest(
client: http2.ClientHttp2Session,
payload: Buffer,
path = "/test.Service/Method",
): Promise<{ receivedBytes: number }> {
return new Promise((resolve, reject) => {
const grpcMessage = createGrpcMessage(payload);
const req = client.request({
":method": "POST",
":path": path,
"content-type": "application/grpc",
te: "trailers",
});
let responseData = Buffer.alloc(0);
req.on("response", headers => {
if (headers[":status"] !== 200) {
reject(new Error(`Unexpected status: ${headers[":status"]}`));
}
});
req.on("data", (chunk: Buffer) => {
responseData = Buffer.concat([responseData, chunk]);
});
req.on("end", () => {
try {
resolve(parseGrpcResponse(responseData));
} catch (e) {
reject(new Error(`Failed to parse gRPC response: ${e}`));
}
});
req.on("error", reject);
req.write(grpcMessage);
req.end();
});
}
beforeAll(async () => {
const server = http2.createSecureServer({
...tls,
allowHTTP1: false,
settings: {
maxFrameSize: 16777215,
maxConcurrentStreams: 100,
initialWindowSize: 1024 * 1024,
},
});
server.on("stream", (stream, _headers) => {
const chunks: Buffer[] = [];
stream.on("data", (chunk: Buffer) => {
chunks.push(chunk);
});
stream.on("end", () => {
const body = Buffer.concat(chunks);
// Parse gRPC message (skip 5-byte header)
if (body.length >= 5) {
const messageLength = body.readUInt32BE(1);
const payload = body.subarray(5, 5 + messageLength);
stream.respond({
":status": 200,
"content-type": "application/grpc",
"grpc-status": "0",
});
// Echo back a gRPC response
const response = createGrpcMessage(Buffer.from(JSON.stringify({ receivedBytes: payload.length })));
stream.end(response);
} else {
stream.respond({ ":status": 400 });
stream.end();
}
});
stream.on("error", err => {
console.error("Stream error:", err);
});
});
server.on("error", err => {
console.error("Server error:", err);
});
const serverPort = await new Promise<number>((resolve, reject) => {
server.listen(0, "127.0.0.1", () => {
const address = server.address();
if (!address || typeof address === "string") {
reject(new Error("Failed to get server address"));
return;
}
resolve(address.port);
});
server.once("error", reject);
});
ctx = {
server,
serverPort,
serverUrl: `https://127.0.0.1:${serverPort}`,
};
});
afterAll(async () => {
if (ctx?.server) {
await closeServer(ctx.server);
}
});
test("gRPC message with 32KB payload", async () => {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
const settings = await waitForSettings(client);
assert.strictEqual(settings.maxFrameSize, 16777215);
const payload = Buffer.alloc(32 * 1024, "x");
const response = await sendGrpcRequest(client, payload);
assert.strictEqual(response.receivedBytes, 32 * 1024);
await closeClient(client);
});
test("gRPC message with 100KB payload", async () => {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
await waitForSettings(client);
const payload = Buffer.alloc(100 * 1024, "y");
const response = await sendGrpcRequest(client, payload);
assert.strictEqual(response.receivedBytes, 100 * 1024);
await closeClient(client);
});
test("multiple concurrent gRPC calls", async () => {
const client = http2.connect(ctx.serverUrl, { rejectUnauthorized: false });
await waitForSettings(client);
const promises = [];
for (let i = 0; i < 5; i++) {
const payload = Buffer.alloc(32 * 1024, String.fromCharCode(97 + i));
promises.push(sendGrpcRequest(client, payload, `/test.Service/Method${i}`));
}
const results = await Promise.all(promises);
for (const result of results) {
assert.strictEqual(result.receivedBytes, 32 * 1024);
}
await closeClient(client);
});
});