https://godoc.org/cloud.google.com/go/storage#ObjectHandle.NewReader

This function fails with the following errors:

2018/06/04 02:53:15 WARNING: GcsPathReader failed: Failed to create GCS Reader: Get https://storage.googleapis.com/chromium-coverage/reports/563960/linux/metadata/tests_and_fuzzers.profdata: API error 5 (urlfetch: DEADLINE_EXCEEDED): ('The read operation timed out',). Stacktrace:
	src/gcs.GcsObjectReader() from src/gcs/gcs.go:32
	src/gcs.GcsPathReader() from src/gcs/gcs.go:53
	src/dashboard.handleReportsPage() from src/dashboard/reports_page.go:130
	src/dashboard.HandleReports() from src/dashboard/reports_page.go:37
	net/http.HandlerFunc.ServeHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:1942
	net/http.(*ServeMux).ServeHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:2238
	appengine_internal.handleFilteredHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/appengine_internal/api_dev.go:102
	net/http.HandlerFunc.ServeHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:1942
	net/http.serverHandler.ServeHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:2568
	net/http.(*conn).serve() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:1825



Another case:

2018/06/04 03:54:30 WARNING: GcsPathReader failed: Failed to create GCS Reader: Get https://storage.googleapis.com/chromium-coverage/reports/563960/linux/metadata/tests_and_fuzzers.profdata: Call error 11: Deadline exceeded (timeout). Stacktrace:
	src/gcs.GcsObjectReader() from src/gcs/gcs.go:32
	src/gcs.GcsPathReader() from src/gcs/gcs.go:53
	src/dashboard.handleReportsPage() from src/dashboard/reports_page.go:134
	src/dashboard.HandleReports() from src/dashboard/reports_page.go:41
	net/http.HandlerFunc.ServeHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:1942
	net/http.(*ServeMux).ServeHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:2238
	appengine_internal.handleFilteredHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/appengine_internal/api_dev.go:102
	net/http.HandlerFunc.ServeHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:1942
	net/http.serverHandler.ServeHTTP() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:2568
	net/http.(*conn).serve() from /home/mmoroz/tools/google-cloud-sdk/platform/google_appengine/goroot-1.8/src/net/http/server.go:1825


And, most importantly, that happens on the server as well:


GcsPathReader failed: Failed to create GCS Reader: Get https://storage.googleapis.com/chromium-coverage/reports/558262/linux/metadata/tests_and_fuzzers.profdata: API error 3 (urlfetch: UNSPECIFIED_ERROR). Stacktrace:
	src/gcs.GcsObjectReader() from src/gcs/gcs.go:32
	src/gcs.GcsPathReader() from src/gcs/gcs.go:53
	src/dashboard.handleReportsPage() from src/dashboard/reports_page.go:130
	src/dashboard.HandleReports() from src/dashboard/reports_page.go:37
	net/http.HandlerFunc.ServeHTTP() from go/src/net/http/server.go:1942
	net/http.(*ServeMux).ServeHTTP() from go/src/net/http/server.go:2238
	appengine_internal.executeRequestSafely() from go/src/appengine_internal/api_prod.go:296
	appengine_internal.(*server).HandleRequest() from go/src/appengine_internal/api_prod.go:232
	runtime.call64() from /goroot/src/runtime/asm_amd64.s:515
	reflect.Value.call() from go/src/reflect/value.go:434
	reflect.Value.Call() from go/src/reflect/value.go:302
	_() from _:427GcsPathReader failed: Failed



Looks like this is happening with large files only (e.g. .profdata), as all regular files work fast.