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CURLINFO_CONN_ID(3) Library Functions Manual CURLINFO_CONN_ID(3) NAME CURLINFO_CONN_ID - ID of the last connection SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONN_ID, curl_off_t *conn_id); DESCRIPTION Pass a pointer to a curl_off_t to receive the connection identifier last used by the handle. Stores -1 if there was no connection used. The connection id is unique among all connections using the same connection cache. This is implicitly the case for all connections in the same multi handle. PROTOCOLS This functionality affects all supported protocols EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); /* Perform the request */ result = curl_easy_perform(curl); if(result == CURLE_OK) { curl_off_t conn_id; result = curl_easy_getinfo(curl, CURLINFO_CONN_ID, &conn_id); if(result == CURLE_OK) { printf("Connection used: %" CURL_FORMAT_CURL_OFF_T "\n", conn_id); } } } } AVAILABILITY Added in curl 8.2.0 RETURN VALUE curl_easy_getinfo(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 CURLINFO_XFER_ID(3), curl_easy_getinfo(3), curl_easy_setopt(3) libcurl 2026-06-11 CURLINFO_CONN_ID(3)
NAME | SYNOPSIS | DESCRIPTION | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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