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Advertises a larger HTTP/2 receive window (connection-level or
per-stream) by sending a WINDOW_UPDATE frame. Needed because RFC 7540
makes the connection-level initial window tunable only via
WINDOW_UPDATE — not SETTINGS — leaving the spec default of 64 KB as
the only reachable value without an API like this.
In hex's `mix deps.get` — many parallel multi-MB tarball downloads
sharing one HTTP/2 connection — raising the connection window from
64 KB to 8 MB via this function drops 10 runs from 32.7s to 29.2s
(10.8%), matching their HTTP/1 pool.
Deliberately asymmetric with get_window_size/2 (which returns the
client *send* window). Docstrings on both carry warning callouts
spelling out send-vs-receive so callers don't assume they round-trip.
Target is :connection or {:request, ref}; grow-only (shrink attempts
return {:error, conn, %HTTPError{reason: :window_size_too_small}});
new_size validated against 1..2^31-1. Tracks the advertised peak on
new receive_window_size fields on the connection and stream.
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Advertises a larger HTTP/2 receive window (connection-level or per-stream) by sending a WINDOW_UPDATE frame. Needed because RFC 7540 makes the connection-level initial window tunable only via WINDOW_UPDATE — not SETTINGS — leaving the spec default of 64 KB as the only reachable value without an API like this.
In hex's
mix deps.get— many parallel multi-MB tarball downloads sharing one HTTP/2 connection — raising the connection window from 64 KB to 8 MB via this function drops 10 runs from 32.7s to 29.2s (10.8%). The time is for the wholemix deps.getcommand so the actual speed up for the HTTP requests is actually a higher percentage.Deliberately asymmetric with get_window_size/2 (which returns the client send window). Docstrings on both carry warning callouts spelling out send-vs-receive so callers don't assume they round-trip.
Target is :connection or {:request, ref}; grow-only (shrink attempts return {:error, conn, %HTTPError{reason: :window_size_too_small}}); new_size validated against 1..2^31-1. Tracks the advertised peak on new receive_window_size fields on the connection and stream.