fix(engine): ignore benign media request aborts

packages/engine/src/services/frameCapture.test.ts

@@ -7,6 +7,7 @@ import {
   formatRequestFailureDiagnostic,
   isFontResourceError,
   sanitizeDiagnosticUrl,
+  shouldIgnoreRequestFailureDiagnostic,
 } from "./frameCapture.js";
 
 describe("isFontResourceError", () => {
@@ -221,4 +222,35 @@ describe("navigation diagnostics", () => {
       }),
     ).toBe("[Browser:HTTP403] GET https://cdn.example.com/frame.png resource=image Forbidden");
   });
+
+  it("ignores benign media aborts without hiding real request failures", () => {
+    expect(
+      shouldIgnoreRequestFailureDiagnostic({
+        resourceType: "media",
+        url: "http://127.0.0.1:4173/assets/video.mp4",
+        failureText: "net::ERR_ABORTED",
+      }),
+    ).toBe(true);
+    expect(
+      shouldIgnoreRequestFailureDiagnostic({
+        resourceType: "other",
+        url: "http://127.0.0.1:4173/assets/audio.oga?cache=1",
+        failureText: "net::ERR_ABORTED",
+      }),
+    ).toBe(true);
+    expect(
+      shouldIgnoreRequestFailureDiagnostic({
+        resourceType: "media",
+        url: "http://127.0.0.1:4173/assets/video.mp4",
+        failureText: "net::ERR_FAILED",
+      }),
+    ).toBe(false);
+    expect(
+      shouldIgnoreRequestFailureDiagnostic({
+        resourceType: "script",
+        url: "http://127.0.0.1:4173/assets/app.js",
+        failureText: "net::ERR_ABORTED",
+      }),
+    ).toBe(false);
+  });
 });

packages/engine/src/services/frameCapture.ts

@@ -341,6 +341,27 @@ export function formatRequestFailureDiagnostic(input: {
   );
 }
 
+/**
+ * Chromium reports media loads that it intentionally cancels during probing as
+ * request failures. They are expected when the probe discovers or seeks local
+ * audio/video and do not indicate a missing asset.
+ */
+export function shouldIgnoreRequestFailureDiagnostic(input: {
+  resourceType: string;
+  url: string;
+  failureText: string;
+}): boolean {
+  if (input.failureText !== "net::ERR_ABORTED") return false;
+  if (input.resourceType === "media") return true;
+  try {
+    return /\.(?:aac|flac|m4a|mp3|mp4|mov|oga|ogg|ogv|wav|webm)$/i.test(
+      new URL(input.url).pathname,
+    );
+  } catch {
+    return false;
+  }
+}
+
 export function formatHttpErrorDiagnostic(input: {
   method: string;
   resourceType: string;
@@ -1581,16 +1602,20 @@ export async function initializeSession(session: CaptureSession): Promise<void>
   });
 
   page.on("requestfailed", (request) => {
-    if (request.resourceType() === "script") {
+    const resourceType = request.resourceType();
+    const url = request.url();
+    const failureText = request.failure()?.errorText ?? "unknown";
+    if (resourceType === "script") {
       recordScriptLoadFailure(session, request.url());
     }
+    if (shouldIgnoreRequestFailureDiagnostic({ resourceType, url, failureText })) return;
     appendBrowserDiagnostic(
       session,
       formatRequestFailureDiagnostic({
         method: request.method(),
-        resourceType: request.resourceType(),
-        url: request.url(),
-        failureText: request.failure()?.errorText ?? "unknown",
+        resourceType,
+        url,
+        failureText,
       }),
     );
   });