elixir-mint / mint / 369c8af6010448c196b51235fe03bd8c118d068c

90%

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github

Keep the HTTP/2 receive window credit in sync when the window shrinks (#507)

Shrinking :initial_window_size adjusted each stream's receive window
size but not its remaining credit. The server applies the difference to
its view of the window as well (RFC 9113 6.9.2), so the next refill
computed an increment of zero or a negative number and sent it in a
WINDOW_UPDATE frame. A negative increment lands in the unsigned 31-bit
field as a value near 2^31, which the server has to answer with a
FLOW_CONTROL_ERROR stream reset (RFC 9113 6.9.1), and a zero increment
is a PROTOCOL_ERROR stream error (RFC 9113 6.9).

The remaining credit now follows the size change, and a refill is only
sent when the increment is positive.

7 of 7 new or added lines in 1 file covered. (100.0%)

1543 of 1743 relevant lines covered (88.53%)

550.2 hits per line