Support legacy WSGI write functions #2920
Open
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Summary
HTTPX already supports calling into WSGI apps.
However, this support does not include legacy (WSGI 1) apps and frameworks that use a write callable. This small PR adds support for these apps and frameworks, without changing the way how the WSGI support works otherwise. It also works as specified in the PEP when both write callable and iterable output are used.
Checklist
(see Add support for WSGI apps using write callables #2921)
(doesn't need documentation - just makes a special case work that didn't work before)