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curl_easy_pause.md: rephrase the stream cache when pause clause

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- mention HTTP/3
- it is 10 MB per stream these days

Closes #21658
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Daniel Stenberg 2026-05-18 15:41:24 +02:00
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14
docs/libcurl/curl_easy_pause.md
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@ -85,14 +85,12 @@ direction, might cause problems or error.
# MULTIPLEXED
When a connection is used multiplexed, like for HTTP/2, and one of the
transfers over the connection is paused and the others continue flowing,
libcurl might end up buffering contents for the paused transfer. It has to do
this because it needs to drain the socket for the other transfers and the
already announced window size for the paused transfer allows the server to
continue sending data up to that window size amount. By default, libcurl
announces a 32 megabyte window size, which thus can make libcurl end up
buffering 32 megabyte of data for a paused stream.
On multiplexed connections (HTTP/2 or HTTP/3), pausing an individual stream
while others remain active forces libcurl to buffer up to 10 MB of data for
the paused transfer. Because libcurl must continuously drain the shared socket
to sustain active streams, and the default flow-control window allows the
server to send up to 10 MB before halting, libcurl is forced to buffer the
incoming bytes in memory.
When such a paused stream is unpaused again, any buffered data is delivered
first.