Moto reset API fails - Connection refused by Responses - the call doesn't match any registered mock

[kogakenji]

I'm using moto==2.0.5 with python 3.7.9.

Test case:

import requests
from moto import mock_s3
import unittest


@mock_s3
class TestMotoReset(unittest.TestCase):
    def test_reset(self):
        requests.post("http://motoapi.amazonaws.com/moto-api/reset")

This gives me the following trace:

Test session starts (platform: darwin, Python 3.7.9, pytest 5.4.2, pytest-sugar 0.9.3)
django: settings:=**.local-settings (from env)
rootdir: /Users/**/src/**, inifile: pytest.ini
plugins: mock-3.1.0, django-3.9.0, sugar-0.9.3, hypothesis-5.14.0, cov-2.8.1
collecting ...

――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― TestMotoReset.test_reset ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

self = <src.lib.tests.example_issue.TestMotoReset testMethod=test_reset>

    def test_reset(self):
>       requests.post("http://motoapi.amazonaws.com/moto-api/reset")

src/lib/tests/example_issue.py:10:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.venv/lib/python3.7/site-packages/requests/api.py:119: in post
    return request('post', url, data=data, json=json, **kwargs)
.venv/lib/python3.7/site-packages/requests/api.py:61: in request
    return session.request(method=method, url=url, **kwargs)
.venv/lib/python3.7/site-packages/requests/sessions.py:542: in request
    resp = self.send(prep, **send_kwargs)
.venv/lib/python3.7/site-packages/requests/sessions.py:655: in send
    r = adapter.send(request, **kwargs)
.venv/lib/python3.7/site-packages/responses/__init__.py:842: in unbound_on_send
    return self._on_request(adapter, request, *a, **kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <responses.RequestsMock object at 0x11c744290>, adapter = <requests.adapters.HTTPAdapter object at 0x11dfd6250>, request = <PreparedRequest [POST]>
kwargs = {'cert': None, 'proxies': OrderedDict(), 'stream': False, 'timeout': None, ...}, match = None, match_failed_reasons = [], resp_callback = None
error_msg = "Connection refused by Responses - the call doesn't match any registered mock.\n\nRequest: \n- POST http://motoapi.amazonaws.com/moto-api/reset\n\nAvailable matches:\n"
i = 0, m = <moto.core.models.CallbackResponse object at 0x11df6b450>

    def _on_request(self, adapter, request, **kwargs):
        # add attributes params and req_kwargs to 'request' object for further match comparison
        # original request object does not have these attributes
        request.params = self._parse_request_params(request.path_url)
        request.req_kwargs = kwargs

        match, match_failed_reasons = self._find_match(request)
        resp_callback = self.response_callback

        if match is None:
            if any(
                [
                    p.match(request.url)
                    if isinstance(p, Pattern)
                    else request.url.startswith(p)
                    for p in self.passthru_prefixes
                ]
            ):
                logger.info("request.allowed-passthru", extra={"url": request.url})
                return _real_send(adapter, request, **kwargs)

            error_msg = (
                "Connection refused by Responses - the call doesn't "
                "match any registered mock.\n\n"
                "Request: \n"
                "- %s %s\n\n"
                "Available matches:\n" % (request.method, request.url)
            )
            for i, m in enumerate(self.registered()):
                error_msg += "- {} {} {}\n".format(
>                   m.method, m.url, match_failed_reasons[i]
                )
E               IndexError: list index out of range

.venv/lib/python3.7/site-packages/responses/__init__.py:813: IndexError

[NielsVanDerWekken]

I encounter a very similar issue where my test session has "platform linux -- Python 3.9.7, pytest-6.2.5, py-1.11.0, pluggy-1.0.0", but using a GET request instead of a POST request.
Somehow this only happens when the tests are ran from AWS, while there is no problem when I run them on my own system.
Using moto==2.3.1, requests==2.27.1

This issue started 11 jan 2022. No problems with the exact same code before that date.

[bblommers]

This issue popped up with the latest release of responses. If you downgrade to 0.16.0, everything should be fine, but Moto does not play well with 0.17.0. (@NielsVanDerWekken I expect that's why it's still working locally, because you're on an older version of responses?)

The intermediate fix is to downgrade responses - we will release a fix soon to make Moto interoperable with the latest version.

[NielsVanDerWekken]

I added responses==0.16.0 to our list of requirements (it was automatically downloaded as a dependency before) and this fixed things. Thanks for pointing this out @bblommers !

[bblommers]

Moto >= 2.3.2.dev2 should work with all versions of responses. I've closed this for now, but do let us know if there are still any issues!

[aicharles]

Just want to say thanks for posting about this issue and the resolution. I had this issue as well as of yesterday and I would have never figured this out on my own.