Does httpretty support multi-threading?

[Florenz A.P. Hollebrandse]

We're attempting to mock HTTP responses requested from within a Python thread pool. Is that supported? The following example suggest it does not work, unfortunately:

import concurrent.futures

import httpretty as _httpretty
import pytest
import requests


@pytest.fixture(scope="session")
def httpretty():
    _httpretty.enable(verbose=True, allow_net_connect=False)
    try:
        yield _httpretty
    finally:
        _httpretty.disable()
        _httpretty.reset()


@pytest.fixture
def mock_response(httpretty):
    def request_callback(request, uri, response_headers):
        return 200, response_headers, request.body  # Pass through the requested body

    httpretty.register_uri(method="POST", uri="https://my-server.com/", body=request_callback)


@pytest.fixture
def example_payloads():
    return [0, 1, 3]


def post(payload):
    r = requests.post("https://my-server.com/", json=payload)
    return r.json()


def test_simple_map_passes(mock_response, example_payloads):
    results = map(post, example_payloads)
    assert list(results) == example_payloads


def test_threadpool_map_fails(mock_response, example_payloads):
    executor = concurrent.futures.ThreadPoolExecutor()
    results = executor.map(post, example_payloads)
    # Responses appear to be randomly drawn (with duplicates) from the expected list
    assert list(results) == example_payloads  

Interestingly, occasionally, the response body appears to be the full string like this:

POST / HTTP/1.1
Host: my-server.com
User-Agent: python-requests/2.31.0
Accept-Encoding: gzip, deflate
Accept: */*
Connection: keep-alive
Content-Length: 1
Content-Type: application/json

which is really not expected at all since it should just contain the JSON data, e.g. 0, 1.

I believe this works with Python 3.8 and 3.9, but fails from Python 3.10 onwards.

[Florenz A.P. Hollebrandse]

@gabrielfalcao Just looking for some feedback on this please.