curl 7.88.1 Release: Bug Fixes for HTTP/2 Multiplexing, Connection Timeout, and Additional Improvements

According to curl author Daniel Stenberg’s roadmap, version 7.88.0 was intended to be the final 7.x release, but a bug in that version prompted a quick follow‑up patch, resulting in the 7.88.1 release.

Bug fixes

HTTP/2 multiplexed data corruption – In certain cases where data is transferred over HTTP/2 multiplexed streams, curl could retrieve incorrect data from its internal buffer, leading to corrupted saved files. This long‑standing bug became more likely after recent changes.

Connection timeout uses full duration – Previously, curl sometimes applied only half of the specified timeout when establishing a connection.

runtests: fix “uninitialized value $port” – Running the test suite in verbose mode triggered an error message about an uninitialized port variable.

Test: ensure gnusev‑tls has SRP support before use – The test suite uses gnusev‑tls to verify SRP authentication. Recent changes to the GnuTLS project disabled SRP by default, so the test now checks for SRP support before attempting to use the tool.

setopt: allow HTTP/3 when HTTP/2 is undefined – If a build does not support HTTP/2, a regression prevented requests from falling back to HTTP/3.

socketpair: allow EWOULDBLOCK when checking read‑pair bytes – Fixes an issue introduced by the 7.88.0 fix that occasionally caused problems (especially on Windows) when validating socketpair emulation, ensuring proper handling of EWOULDBLOCK.

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