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Raise default HTTP/2 receive windows and batch HTTP/2 receive-window refills #481

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Raise default HTTP/2 receive windows and batch HTTP/2 receive-window refills #481

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8eb787d
Add Mint.HTTP2.set_window_size/3
ericmj Apr 12, 2026
26759f2
Rename window_size field to send_window_size
ericmj Apr 13, 2026
3aced03
Raise default HTTP/2 receive windows
ericmj Apr 13, 2026
d425d96
Batch HTTP/2 receive-window refills
ericmj Apr 13, 2026
5d8c622
Track advertised receive window synchronously in initiate/5
ericmj Apr 13, 2026
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14 changes: 14 additions & 0 deletions lib/mint/http.ex
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Expand Up @@ -238,6 +238,20 @@ defmodule Mint.HTTP do
server. See `Mint.HTTP2.put_settings/2` for more information. This is only used
in HTTP/2 connections.

* `:connection_window_size` - (integer) the initial size of the connection-level
HTTP/2 receive window, in bytes. Sent to the server as a `WINDOW_UPDATE` frame
on stream 0 as part of the connection preface. Defaults to 16 MB. Can be
raised later with `Mint.HTTP2.set_window_size/3`.

* `:receive_window_update_threshold` - (integer) the minimum number of bytes of receive
window that must remain on a connection or stream before a `WINDOW_UPDATE`
frame is sent to refill it. Lower values send more frequent, smaller updates;
higher values batch updates into fewer, larger ones. Defaults to 160_000
(approximately 10× the default max frame size). The same threshold applies
to both the connection and per-stream windows; when a window's peak size is
at or below the threshold, the client refills after every DATA frame on
that window.

There may be further protocol specific options that only take effect when the corresponding
connection is established. Check `Mint.HTTP1.connect/4` and `Mint.HTTP2.connect/4` for
details.
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