`deferred` module doesn't work

[crloz]

Expected Behavior

A new task is enqueued and executed via google.appengine.ext.deferred

Actual Behavior

An error occurs preventing the task from being enqueued
Logs:

INFO     2021-10-11 17:23:14,208 module.py:883] default: "GET /test HTTP/1.1" 200 17
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 754, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue_stub.py", line 2192, in MainLoop
    self._ProcessQueues()
  File "/usr/lib/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue_stub.py", line 2137, in _ProcessQueues
    response_code = self.task_executor.ExecuteTask(task, queue)
  File "/usr/lib/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue_stub.py", line 2069, in ExecuteTask
    '0.1.0.2')
  File "/usr/lib/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/dispatcher.py", line 802, in add_request
    fake_login=fake_login)
  File "/usr/lib/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/module.py", line 1249, in build_request_environ
    'wsgi.input': six.StringIO(six.ensure_text(body))
  File "/usr/lib/google-cloud-sdk/platform/google_appengine/lib/six-1.12.0/six/__init__.py", line 904, in ensure_text
    return s.decode(encoding, errors)
  File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x80 in position 0: invalid start byte

Steps to Reproduce the Problem

I am running the code in a container created from the official image gcr.io/google.com/cloudsdktool/cloud-sdk:latest

1. Using the example from the README, set use_deferred=True:
   main.py:

import google.appengine.api
from google.appengine.ext import deferred

from flask import Flask

def dummy_deferred(msg='dummy'):
    print(msg)

app = Flask(__name__)
app.wsgi_app = google.appengine.api.wrap_wsgi_app(app.wsgi_app, use_deferred=True)

@app.route('/test')
def api():
    deferred.defer(dummy_deferred)
    return {'m': 'it works'}

app.yaml

runtime: python37
app_engine_apis: true
entrypoint: gunicorn main:app

2. Run the app: dev_appserver.py --require_indexes=yes --support_datastore_emulator=yes --clear_datastore=yes app.yaml
3. Open the browser and go to http://127.0.0.1:8080/test

Specifications

• Version: 0.2.2
• Platform: Linux (Official Docker Image)