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
behaviors.
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
CURLOPT_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. Read "raw" WebSocket traffic from the
CURLOPT_READFUNCTION(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 result;
curl_easy_setopt(curl, CURLOPT_URL, "ws://example.com/");
/* tell curl we deal with all the WebSocket logic ourselves */
curl_easy_setopt(curl, CURLOPT_WS_OPTIONS, CURLWS_RAW_MODE);
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
HISTORY
CURLWS_RAW_MODE and CURLWS_NOAUTOPONG macros became long types in
8.16.0, prior to this version a long cast was necessary when passed to
curl_easy_setopt(3).
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 2026-03-23 CURLOPT_WS_OPTIONS(3)
curl 8.19.0 - Generated Tue Mar 31 15:40:24 CDT 2026