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websocket: support CURLOPT_READFUNCTION

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Add support for CURLOPT_READFUNCTION with WebSocket urls when *not* in
connect-only mode, e.g. when using curl_multi_perform.

Install the callback function and set CURLOPT_UPLOAD. Return
CURL_READFUNC_PAUSE when having nothing more to send and unpause the
transfer when more data is ready.

This will send the read bytes in a WebSocket BINARY frame.

Add support for this mode in the pytest "ws_data" client and have all
tests run in 'curl_ws_send/recv' and 'peform' mode as well.

Add `curl_ws_start_frame()`. Document, cover in libcurl-ws.md and
explain the READFUNCTION mode for websockets.

Add example `websocket-updown` for this.

Closes #17683
This commit is contained in:
Stefan Eissing 2025-07-08 09:15:43 +02:00 • committed by Daniel Stenberg
parent 756c0718c2
commit 37cecfc7b9
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17 changed files with 878 additions and 156 deletions
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scripts/singleuse.pl
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@ -155,6 +155,7 @@ my %api = (
'curl_ws_meta' => 'API',
'curl_ws_recv' => 'API',
'curl_ws_send' => 'API',
'curl_ws_start_frame' => 'API',
# the following functions are provided globally in debug builds
'curl_easy_perform_ev' => 'debug-build',