fix(httpreplay): ignore GCS header by default (#8260)

New GCS header x-goog-gcs-idempotency-token should be on the list to be ignored by default. Also change the integration test so that the test isn't explicitly requesting that it be ignored.

Fixes #8233

Author: tritone

httpreplay/cmd/httpr/integration_test.go

@@ -149,8 +149,6 @@ func start(modeFlag, filename string) (*exec.Cmd, *http.Transport, string, error
 		modeFlag,
 		filename,
 		"-debug-headers",
-		"-ignore-header", "X-Goog-Api-Client",
-		"-ignore-header", "X-Goog-Gcs-Idempotency-Token",
 	)
 	if err := cmd.Start(); err != nil {
 		return nil, nil, "", err

httpreplay/httpreplay_test.go

@@ -67,8 +67,6 @@ func TestIntegration_RecordAndReplay(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	rec.RemoveRequestHeaders("X-Goog-Api-Client")
-	rec.RemoveRequestHeaders("X-Goog-Gcs-Idempotency-Token")
 
 	hc, err := rec.Client(ctx, option.WithTokenSource(
 		testutil.TokenSource(ctx, storage.ScopeFullControl)))
@@ -86,8 +84,6 @@ func TestIntegration_RecordAndReplay(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	rep.IgnoreHeader("X-Goog-Api-Client")
-	rep.IgnoreHeader("X-Goog-Gcs-Idempotency-Token")
 	defer rep.Close()
 	hc, err = rep.Client(ctx)
 	if err != nil {

httpreplay/internal/proxy/converter.go

@@ -79,8 +79,9 @@ var (
 		"Via",
 		"X-Forwarded-*",
 		// Google-specific
-		"X-Cloud-Trace-Context", // OpenCensus traces have a random ID
-		"X-Goog-Api-Client",     // can differ for, e.g., different Go versions
+		"X-Cloud-Trace-Context",        // OpenCensus traces have a random ID
+		"X-Goog-Api-Client",            // can differ for, e.g., different Go versions
+		"X-Goog-Gcs-Idempotency-Token", // Used by Cloud Storage
 	}
 
 	defaultRemoveBothHeaders = []string{