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CURLINFO_PROTOCOL(3) Library Functions Manual CURLINFO_PROTOCOL(3) NAME CURLINFO_PROTOCOL - get the protocol used in the connection SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PROTOCOL, long *p); DESCRIPTION This option is deprecated. We strongly recommend using CURLINFO_SCHEME(3) instead, because this option cannot return all pos- sible protocols. Pass a pointer to a long to receive the version used in the last http connection. The returned value is set to one of these values: CURLPROTO_DICT, CURLPROTO_FILE, CURLPROTO_FTP, CURLPROTO_FTPS, CURLPROTO_GOPHER, CURLPROTO_HTTP, CURLPROTO_HTTPS, CURLPROTO_IMAP, CURLPROTO_IMAPS, CURLPROTO_LDAP, CURLPROTO_LDAPS, CURLPROTO_POP3, CURLPROTO_POP3S, CURLPROTO_RTMP, CURLPROTO_RTMPE, CURLPROTO_RTMPS, CURLPROTO_RTMPT, CURLPROTO_RTMPTE, CURLPROTO_RTMPTS, CURLPROTO_RTSP, CURLPROTO_SCP, CURLPROTO_SFTP, CURLPROTO_SMB, CURLPROTO_SMBS, CURLPROTO_SMTP, CURLPROTO_SMTPS, CURLPROTO_TELNET, CURLPROTO_TFTP, CURLPROTO_MQTT PROTOCOLS This functionality affects all supported protocols EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); res = curl_easy_perform(curl); if(res == CURLE_OK) { long protocol; curl_easy_getinfo(curl, CURLINFO_PROTOCOL, &protocol); } curl_easy_cleanup(curl); } } DEPRECATED Deprecated since 7.85.0. AVAILABILITY Added in curl 7.52.0 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_RESPONSE_CODE(3), curl_easy_getinfo(3), curl_easy_setopt(3) libcurl 2025-06-03 CURLINFO_PROTOCOL(3)
NAME | SYNOPSIS | DESCRIPTION | PROTOCOLS | EXAMPLE | DEPRECATED | AVAILABILITY | RETURN VALUE | SEE ALSO
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