CURLOPT_WS_OPTIONS(3) Library Functions Manual CURLOPT_WS_OPTIONS(3)
NAME
CURLOPT_WS_OPTIONS - WebSocket behavior options
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WS_OPTIONS, long bitmask);
DESCRIPTION
Pass a long with a bitmask to tell libcurl about specific WebSocket be-
haviors.
To detach a WebSocket connection and use the curl_ws_send(3) and
curl_ws_recv(3) functions after the HTTP upgrade procedure, set the CUR-
LOPT_CONNECT_ONLY(3) option to 2L.
Available bits in the bitmask
CURLWS_RAW_MODE (1)
Deliver "raw" WebSocket traffic to the CURLOPT_WRITEFUNCTION(3)
callback.
In raw mode, libcurl does not handle pings or any other frame for
the application.
CURLWS_NOAUTOPONG (2)
Disable the automatic reply to PING messages. This means users
must send a PONG message with curl_ws_send(3). This feature is
added with version 8.14.0.
DEFAULT
0
PROTOCOLS
This functionality affects ws only
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "ws://example.com/");
/* tell curl we deal with all the WebSocket magic ourselves */
curl_easy_setopt(curl, CURLOPT_WS_OPTIONS, (long)CURLWS_RAW_MODE);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.86.0
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLOPT_CONNECT_ONLY(3), curl_ws_recv(3), curl_ws_send(3)
libcurl 2026-07-12 CURLOPT_WS_OPTIONS(3)
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