Fix numeric header in node http server (#19811)

src/bun.js/bindings/NodeHTTP.cpp

@@ -675,7 +675,7 @@ static void assignHeadersFromUWebSocketsForCall(uWS::HttpRequest* request, JSVal
             RETURN_IF_EXCEPTION(scope, void());
 
         } else {
-            headersObject->putDirect(vm, nameIdentifier, jsValue, 0);
+            headersObject->putDirectMayBeIndex(globalObject, nameIdentifier, jsValue);
             arrayValues.append(nameString);
             arrayValues.append(jsValue);
             RETURN_IF_EXCEPTION(scope, void());

test/js/node/http/numeric-header.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, test } from "bun:test";
+import { createServer } from "http";
+
+describe("HTTP numeric headers", () => {
+  test("should handle numeric header names", async () => {
+    const server = createServer((req, res) => {
+      // Get the custom header value
+      expect(req.headers["1234"]).toBe("Hello from client!");
+      expect("1234" in req.headers).toBe(true);
+      expect(req.headers[1234]).toBe("Hello from client!");
+
+      const customHeader = req.headers["1234"];
+
+      // Send response with the header value
+      res.writeHead(200, { "Content-Type": "text/plain" });
+      res.end(`Received header value: ${customHeader}`);
+    });
+
+    // Start server on random port
+    const port = await new Promise<number>(resolve => {
+      server.listen(0, () => {
+        const address = server.address();
+        if (address && typeof address === "object") {
+          resolve(address.port);
+        }
+      });
+    });
+
+    // Make fetch request to the server
+    const response = await fetch(`http://localhost:${port}/`, {
+      headers: {
+        "1234": "Hello from client!",
+      },
+    });
+
+    const data = await response.text();
+    expect(data).toBe("Received header value: Hello from client!");
+
+    server.close();
+  });
+});