CURLOPT_WS_OPTIONS(3) libcurl CURLOPT_WS_OPTIONS(3)

CURLOPT_WS_OPTIONS - WebSocket behavior options

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WS_OPTIONS, long bitmask);

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

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.

0

WebSocket

CURL *curl = curl_easy_init();
if(curl) {
  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);
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

Added in 7.86.0

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

curl_ws_recv(3), curl_ws_send(3), CURLOPT_CONNECT_ONLY(3)

September 26, 2023 ibcurl 8.4.0