fix: silence abort error in http agent (#420)

* fix: silence abort error in http agent

Author: ranst91

typescript-sdk/packages/client/src/run/http-request.ts

@@ -76,7 +76,13 @@ export const runHttpRequest = (url: string, requestInit: RequestInit): Observabl
         })();
 
         return () => {
-          reader.cancel();
+          reader.cancel().catch((error) => {
+            if ((error as DOMException)?.name === "AbortError") {
+              return;
+            }
+
+            throw error;
+          });
         };
       });
     }),

typescript-sdk/packages/client/src/transform/__tests__/http.test.ts

@@ -54,6 +54,40 @@ describe("transformHttpEventStream", () => {
     expect(receivedEvents).toEqual([mockBaseEvent]);
   });
 
+  test("should emit RUN_ERROR and complete on AbortError without erroring", () => {
+    const mockHttpSource = new Subject<HttpEvent>();
+    const receivedEvents: BaseEvent[] = [];
+    let completed = false;
+    let receivedError: unknown = undefined;
+
+    const result$ = transformHttpEventStream(mockHttpSource);
+    result$.subscribe({
+      next: (event) => receivedEvents.push(event),
+      error: (err) => {
+        receivedError = err;
+      },
+      complete: () => {
+        completed = true;
+      },
+    });
+
+    mockHttpSource.next({
+      type: HttpEventType.HEADERS,
+      status: 200,
+      headers: new Headers([["content-type", "text/event-stream"]]),
+    });
+
+    const abortError = { name: "AbortError" } as DOMException;
+    mockHttpSource.error(abortError);
+
+    expect(receivedEvents).toHaveLength(1);
+    expect(receivedEvents[0].type).toBe(EventType.RUN_ERROR);
+    const runErrorEvent = receivedEvents[0] as any;
+    expect(runErrorEvent.rawEvent).toBe(abortError);
+    expect(completed).toBe(true);
+    expect(receivedError).toBeUndefined();
+  });
+
   test("should handle parseProtoStream errors", (done) => {
     // Given
     const mockHttpSource = new Subject<HttpEvent>();

typescript-sdk/packages/client/src/transform/http.ts

@@ -4,6 +4,7 @@ import { HttpEvent, HttpEventType } from "../run/http-request";
 import { parseSSEStream } from "./sse";
 import { parseProtoStream } from "./proto";
 import * as proto from "@ag-ui/proto";
+import { EventType } from "@ag-ui/core";
 
 /**
  * Transforms HTTP events into BaseEvents using the appropriate format parser based on content type.
@@ -47,7 +48,17 @@ export const transformHttpEventStream = (source$: Observable<HttpEvent>): Observ
                 eventSubject.error(err);
               }
             },
-            error: (err) => eventSubject.error(err),
+            error: (err) => {
+              if ((err as DOMException)?.name === "AbortError") {
+                eventSubject.next({
+                  type: EventType.RUN_ERROR,
+                  rawEvent: err,
+                });
+                eventSubject.complete();
+                return;
+              }
+              return eventSubject.error(err)
+            },
             complete: () => eventSubject.complete(),
           });
         }