Problem you have encountered:

I have an App Engine application, written in Go using the go111 runtime and the v1 App Engine Go libraries. It contains a "delay function", an abstraction over App Engine task queues. A delay function is implemented as a HTTP handler, with the arguments binary-encoded (using the gob package) in the request body.

As far as I can tell, the task queue emulator however insists on the request body being valid UTF-8, which (AIUI) the gob output isn't.

Example output:

Exception in thread Thread-1:
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 "/home/bsiegert/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue_stub.py", line 2192, in MainLoop
    self._ProcessQueues()
  File "/home/bsiegert/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 "/home/bsiegert/google-cloud-sdk/platform/google_appengine/google/appengine/api/taskqueue/taskqueue_stub.py", line 2069, in ExecuteTask
    '0.1.0.2')
  File "/home/bsiegert/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/dispatcher.py", line 803, in add_request
    fake_login=fake_login)
  File "/home/bsiegert/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 "/home/bsiegert/google-cloud-sdk/platform/google_appengine/google/appengine/_internal/six/__init__.py", line 952, 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 0xff in position 1: invalid start byte

INFO     2022-03-20 14:59:47,509 module.py:883] default: "POST /_ah/mail/builds%40bulktracker.appspotmail.com HTTP/1.1" 200 -

What you expected to happen:

I expected the function call to work in the local emulator. Notably, this used to work when I last tried it, some months ago.

Steps to reproduce:

$ git clone https://github.com/bsiegert/BulkTracker
$ cd BulkTracker
$ dev_appserver.py app.yaml

In another terminal:

$ cd BulkTracker/testing/btinject
$ go build .
$ ./btinject

Other information (workarounds you have tried, documentation consulted, etc):

I have App Engine Go extensions version 1.9.71 and gcloud app Python extensions version 1.9.99.

Issue 225584760

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