Firebase admin proxy issue

Note: my firebase code is running on container behind the proxy and in my code i am configurating it like in image below .

Note: I used curl command to send notification using proxy and it works like a charm

but firebase admin code gives this error

{“EntryDate”:“Fri Jun 28 09:34:42 +00:00 2019”,“Level”:“ERROR”,“Message”:{“body”:"FirebaseAdmin.FirebaseException: Error while calling the FCM service. —> System.Net.Http.HttpRequestException: No such device or address —> System.Net.Sockets.SocketException: No such device or address\n at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)\n — End of inner exception stack trace —\n at Google.Apis.Http.ConfigurableMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\n at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)\n at Google.Apis.Auth.OAuth2.Requests.TokenRequestExtenstions.ExecuteAsync(TokenRequest request, HttpClient httpClient, String tokenServerUrl, CancellationToken taskCancellationToken, IClock clock)\n at Google.Apis.Auth.OAuth2.ServiceAccountCredential.RequestAccessTokenAsync(CancellationToken taskCancellationToken)\n at Google.Apis.Auth.OAuth2.TokenRefreshManager.RefreshTokenAsync()\n at Google.Apis.Auth.OAuth2.TokenRefreshManager.ResultWithUnwrappedExceptions[T](Task1 task)\n at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()\n at System.Threa

| ding.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)\n— End of stack trace from previous location where exception was thrown —\n at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)\n— End of stack trace from previous location where exception was thrown —\n at Google.Apis.Auth.OAuth2.TokenRefreshManager.GetAccessTokenForRequestAsync(CancellationToken cancellationToken)\n at Google.Apis.Auth.OAuth2.ServiceAccountCredential.GetAccessTokenForRequestAsync(String authUri, CancellationToken cancellationToken)\n at Google.Apis.Auth.OAuth2.ServiceCredential.InterceptAsync(HttpRequestMessage request, CancellationToken cancellationToken)\n at Google.Apis.Http.ConfigurableMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\n at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)\n at Google.Apis.Requests.BatchRequest.ExecuteAsync(CancellationToken cancellationToken)\n at FirebaseAdmin.Messaging.FirebaseMessagingClient.SendBatchRequestAsync(IEnumerable1 messages, Boolean dryRun, CancellationToken cancellationToken)\n at FirebaseAdmin.Messaging.FirebaseMessagingClient.SendAllAsync(IEnumerable1 messages, Boolean dryRun, CancellationToken cancellationToken)\n --- End of inner exception stack trace ---\n at FirebaseAdmin.Messaging.FirebaseMessagingClient.SendAllAsync(IEnumerable1 messages, Boolean dryRun, CancellationToken cancellationToken)\n at FirebaseAdmin.Messaging.FirebaseMessaging.SendAllAsync(IEnumerable1 messages, Boolean dryRun, CancellationToken cancellationToken)\n at FirebaseAdmin.Messaging.FirebaseMessaging.SendAllAsync(IEnumerable1 messages, Boolean dryRun)\n at FirebaseAdmin.Messaging.FirebaseMessaging.SendAllAsync(IEnumerable1 messages)\n at PushNotificationsService.FirebaseHandler.FirebaseMessageComposer.SendMessageBatch(List1 messages) in /opt/app-root/src/Pu

[hiranya911]

It’s the GoogleCredential that is failing to connect to the remote server. You have to also pass your proxy configuration to the credential. See the example at https://medium.com/google-cloud/accessing-google-cloud-apis-though-a-proxy-fe46658b5f2a

[hiranya911]

You need to pass your ProxyHttpClientFactory to GoogleCredential as well. See the example I referenced above.