TransportError when running within App Engine

[firebase]

TransportError when running within App Engine

[hiranya911]

I will close this issue, since there's not much we can do from our end to resolve the issues discussed here. We can continue to follow up with the Google cloud and google-auth team to get these issues addressed in the long run.

[hiranya911]

I've created an issue for the google-auth library documenting some of the pain points related to App Engine support. Hopefully we can get some useful feedback from them.

As for the poor support from the dev appserver, this is a long running issue and many other projects are experiencing the same problem. However, there are several workarounds. For me adding the following bit of code into the appengine_config.pysolved the issue:

import os
import google
import imp
import inspect
from google.appengine.ext import vendor

from google.appengine.tools.devappserver2.python import sandbox
sandbox._WHITE_LIST_C_MODULES += ['_ssl', '_socket']

runtime_path = os.path.realpath(inspect.getsourcefile(inspect))
runtime_dir = os.path.dirname(runtime_path)

# Patch and reload the socket module implementation.
system_socket = os.path.join(runtime_dir, 'socket.py')
imp.load_source('socket', system_socket)

# Patch and reload the ssl module implementation.
system_ssl = os.path.join(runtime_dir, 'ssl.py')
imp.load_source('ssl', system_ssl)

This basically whitelists the socket and ssl libraries for the dev app server, and uses the system-level socket library instead of the one packaged with the App Engine SDK. Your mileage may vary.

[google-oss-bot]

Hey there! I couldn't figure out what this issue is about, so I've labeled it for a human to triage. Hang tight.

[google-oss-bot]

Hmmm this issue does not seem to follow the issue template. Make sure you provide all the required information.

[hiranya911]

I believe this is the expected behavior. The requests library is known to not work on App Engine dev app server. On production you need to enable billing for it to work. See https://stackoverflow.com/questions/9604799/can-python-requests-library-be-used-on-google-app-engine

[rjvir]

Thanks.

Then maybe a feature request would be for this library to work on the App Engine dev app server. I think this would be very helpful for developers, myself included.

The monkeypatch described in this answer seems like a simple solution and is recommended by Google, and it's one I've used myself with success.

[hiranya911]

The monkeypatch is the recommended solution, but it should be done in the main.py of the web app. This cannot be built into the Admin SDK. As for supporting the dev app server, that's really a bug in dev appserver code.

[titocosta]

Just updated to Google App Engine Python 1.9.77 which raises an exception when importing sandbox.
Therefore the workaround suggested above stopped working.