small fix, check if the method has been reassigned.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/js/node/http.ts b/src/js/node/http.ts
index 253bcf4d8..3a283912e 100644
--- a/src/js/node/http.ts
+++ b/src/js/node/http.ts
@@ -972,6 +972,7 @@ export class ServerResponse extends Writable {
     this.#firstWrite = undefined;
     this._writableState.decodeStrings = false;
     this.#deferred = undefined;
+    this.#originalWriteHead = this.writeHead;
   }
 
   req;
@@ -989,7 +990,7 @@ export class ServerResponse extends Writable {
   _removedContLen = false;
   #deferred: (() => void) | undefined = undefined;
   #finished = false;
-
+  #originalWriteHead: (statusCode, statusMessage, headers) => ServerResponse;
   // Express "compress" package uses this
   _implicitHeader() {
     // @ts-ignore
@@ -1061,7 +1062,9 @@ export class ServerResponse extends Writable {
       var data = this.#firstWrite || "";
       this.#firstWrite = undefined;
       this.#finished = true;
-      this._implicitHeader();
+      if (this.writeHead !== this.#originalWriteHead) {
+        this._implicitHeader();
+      }
       this._reply(
         new Response(data, {
           headers: this.#headers,