azure - Error while processing request in AzureMobile Apps HTTP2 error

Question

This question is specific to a lately strange behavior of the Azure mobile Apps Android sdk. Everything was working fine for weeks. Now, my android client app suddenly can't connect to my web app any more. A Toast says "Error while processing request". In Android Studio debugger, I found the exception inside the SDK file MobileServiceConnection.java.

java.io.IOException: stream was reset: PROTOCOL_ERROR

In Azure Portal, my app shows "Healthy" status, but I can see the HTTP errors. Please help. Following is my code, which was working fine and now throws error.

// Create the Mobile Service Client instance, using the provided mobile app URL.
            try {
                mClient = new MobileServiceClient(mMobileBackendUrl, activityContext).withFilter(

                new ServiceFilter() {
                    @Override
                    public ListenableFuture<ServiceFilterResponse> handleRequest(ServiceFilterRequest request, NextServiceFilterCallback nextServiceFilter) {
                        // Get the request contents
                        String url = request.getUrl();
                        String content = request.getContent();

                        if (url != null) {
                            Log.d("Request URL:", url);
                        }

                        if (content != null) {
                            Log.d("Request Content:", content);
                        }

                        // Execute the next service filter in the chain
                        ListenableFuture<ServiceFilterResponse> responseFuture = nextServiceFilter.onNext(request);

                        Futures.addCallback(responseFuture, new FutureCallback<ServiceFilterResponse>() {
                            @Override
                            public void onFailure(Throwable exception) {
                                Log.d("Exception:", exception.getMessage());
                            }

                            @Override
                            public void onSuccess(ServiceFilterResponse response) {
                                if (response != null && response.getContent() != null) {
                                    Log.d("Response Content:", response.getContent());
                                }
                            }
                        });

                        return responseFuture;
                    }
                }
);

            setAzureClient(mClient);
            }catch(MalformedURLException e){
                createAndShowDialog(new Exception("There was an error creating the Mobile Service. Verify the URL"), "Error");
            }catch(Exception e){
                createAndShowDialog("There was an error creating the Mobile Service. "+ e.toString(), "Error");
            }

            Toast.makeText(context, context.getString(R.string.online_authentication), Toast.LENGTH_SHORT).show();
            authenticate();

    }

    private void authenticate() { // give access only to authenticated users via Google account authentication
        HashMap<String, String> parameters = new HashMap<>();
        parameters.put("access_type", "offline");//use "Refresh tokens"
        //login with the Google provider. This will create a call to onActivityResult() method inside the context Activity, which will then call the onActivityResult() below.
        mClient.login(MobileServiceAuthenticationProvider.Google, url_scheme_of_your_app, GOOGLE_LOGIN_REQUEST_CODE, parameters);

    }


@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // When request completes
        if (requestCode == 1) {
            try {
                MobileServiceActivityResult result = mClient.onActivityResult(data);
                if (result.isLoggedIn()) {
                    Toast.makeText(context, context.getString(R.string.azure_auth_login_success) /*+ " " + mClient.getCurrentUser().getUserId()*/, Toast.LENGTH_SHORT).show();
                    mUserId = mClient.getCurrentUser().getUserId();

                } else {//>>>>THIS IS WHERE I AM GETTING THE ERROR
                    String errorMessage = result.getErrorMessage();
                    Toast.makeText(context, errorMessage, Toast.LENGTH_SHORT).show();// Error While processing request (it comes form the MobileServiceConnection.java file inside sdk)

                }
            }catch(Exception e){
                Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show();
            }
        }
    }

Answer 1

I found the answer myself. The error was due to an Azure App Service HTTP2 connection issue. It has nothing to do with the app code. For anyone facing the same problem, here is the solution.

1. Go to https://resources.azure.com/
2. Make sure you are in Read/Write mode by clicking in the option to the left of your name.
3. From the left column, browse to: https://resources.azure.com/subscriptions/yourSubscriptionId/resourceGroups/yourWebAppResourceGroup/providers/Microsoft.Web/sites/yourWebAppName/config/web
4. Find and Change the property: "http20Enabled": from true to false by clicking EDIT, Update value to “false” and then clicking in Save or PATCH.