python network_error ai_generated true

httpx.ConnectError: [Errno 111] 连接被拒绝 # 尽管使用了 respx / pytest-httpx mock

httpx.ConnectError: [Errno 111] Connection refused # despite using respx / pytest-httpx mock

ID: python/pytest-httpx-mock-not-applied

其他格式: JSON · Markdown 中文 · English

80%修复率

85%置信度

0证据数

2026-01-15首次发现

版本兼容性

版本	状态	引入	弃用	备注
0.21	active	—	—	—

根因分析

HTTP 客户端在 mock 应用之前被实例化，或 mock 针对的客户端实例与被测代码使用的实例不同。

English

The HTTP client was instantiated before the mock was applied, or the mock targets a different client instance than the one used by the code under test.

generic

解决方案

95% 成功率

import respx, httpx

def test_fetch(respx_mock):
    respx_mock.get('https://api.example.com/data').mock(
        return_value=httpx.Response(200, json={'ok': True})
    )
    client = httpx.Client()  # created after mock
    assert client.get('https://api.example.com/data').json()['ok']

92% 成功率

def test_fetch(httpx_mock):
    httpx_mock.add_response(json={'ok': True})
    with httpx.Client() as c:
        assert c.get('https://api.example.com/data').json()['ok']

无效尝试

常见但无效的做法:

80% 失败
If the client is module-level or created earlier, the transport is already bound and the mock is bypassed.
95% 失败
No such env var; respx/pytest-httpx don't read it, so the real network is still used.
70% 失败
Fragile against httpx internal changes and misses async variants; can break unrelated tests.