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http2: fix stream window size after unpausing

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When pausing a HTTP/2 transfer, the stream's local window size
is reduced to 0 to prevent the server from sending further data
which curl cannot write out to the application.

When unpausing again, the stream's window size was not correctly
increased again. The attempt to trigger a window update was
ignored by nghttp2, the server never received it and the transfer
stalled.

Add a debug feature to allow use of small window sizes which
reproduces this bug in test_02_21.

Fixes #16955
Closes #16960
This commit is contained in:
Stefan Eissing 2025-04-04 10:43:13 +02:00 • committed by Daniel Stenberg
parent dac78ae638
commit 5fbd78eb2d
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5
docs/libcurl/libcurl-env-dbg.md
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@ -147,3 +147,8 @@ Make a blocking, graceful shutdown of all remaining connections when
a multi handle is destroyed. This implicitly triggers for easy handles
that are run via easy_perform. The value of the environment variable
gives the shutdown timeout in milliseconds.
## `CURL_H2_STREAM_WIN_MAX`
Set to a positive 32-bit number to override the HTTP/2 stream window's
default of 10MB. Used in testing to verify correct window update handling.