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MockTransport doesn't set the elapsed property #3712
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on Dec 9, 2025 This issue already has two PRs with proposed fixes, but for now I suggest a very simple way to fix it without extra boilerplate code. We can close the PRs until we make a good design decision around this.
You can write a very simple wrapper around that mock transport and use it instead of the default one. Then you can handle the elapsed time for mocked responses however you want, like this.
from __future__ import annotations from datetime import timedelta import httpx class CustomMock(httpx.BaseTransport): def __init__(self, next_transport: httpx.BaseTransport | None = None) -> None: self._next_transport = httpx.MockTransport() if next_transport is None else next_transport def handle_request(self, request: httpx.Request) -> httpx.Response: response = self._next_transport.handle_request(request) response.elapsed = timedelta() return response # use custom mock instead of the default mock
- added a commit that references this issue
on Jan 7, 2026 - added a commit that references this issue
on Feb 8, 2026
This is not a nice solution:
If you have dispatch code in that handler that can easily get boilerplatey.
I think httpx should do either of these: