feat(ext/http): abort signal when request is cancelled (#26761)

Closes https://github.com/denoland/deno/issues/21653

1 files changed, 11 insertions, 5 deletions

diff --git a/ext/fetch/23_request.js b/ext/fetch/23_request.js
index 6211e927d..22c17d6d2 100644
--- a/ext/fetch/23_request.js
+++ b/ext/fetch/23_request.js
@@ -269,19 +269,25 @@ class Request {
   /** @type {AbortSignal} */
   get [_signal]() {
     const signal = this[_signalCache];
-    // This signal not been created yet, and the request is still in progress
-    if (signal === undefined) {
+    // This signal has not been created yet, but the request has already completed
+    if (signal === false) {
       const signal = newSignal();
       this[_signalCache] = signal;
+      signal[signalAbort](signalAbortError);
       return signal;
     }
-    // This signal has not been created yet, but the request has already completed
-    if (signal === false) {
+
+    // This signal not been created yet, and the request is still in progress
+    if (signal === undefined) {
       const signal = newSignal();
       this[_signalCache] = signal;
-      signal[signalAbort](signalAbortError);
       return signal;
     }
+
+    if (!signal.aborted && this[_request].isCancelled) {
+      signal[signalAbort](signalAbortError);
+    }
+
     return signal;
   }
   get [_mimeType]() {