CURLOPT_PROTOCOLS_STR - allowed protocols
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROTOCOLS_STR, char *spec);
Pass a pointer to a string that holds a comma-separated list of case insensitive
protocol names (URL schemes) to allow in the transfer. This option allows
applications to use libcurl built to support a wide range of protocols but
still limit specific transfers to only be allowed to use a subset of them. By
default, libcurl accepts all protocols it was built with support for. See also
CURLOPT_REDIR_PROTOCOLS_STR(3).
If trying to set a non-existing protocol or if no matching protocol at all is
set, it returns error.
These are the available protocols:
DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS,
MQTT, POP3, POP3S, RTMP, RTMPE, RTMPS, RTMPT, RTMPTE, RTMPTS, RTSP, SCP, SFTP,
SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS, WSS
You can set "ALL" as a short-cut to enable all protocols. Note that by
setting all, you may enable protocols that were not supported the day you
write this but are introduced in a future libcurl version.
curl_version_info(3) can be used to get a list of all supported protocols
in the current libcurl.
CURLINFO_SCHEME(3) is the recommended way to
figure out the protocol used in a previous transfer.
All protocols built-in
All
curl = curl_easy_init();
if(curl) {
/* pass in the URL from an external source */
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
/* only allow HTTP, TFTP and SFTP */
curl_easy_setopt(curl, CURLOPT_PROTOCOLS_STR, "http,tftp,sftp");
/* Perform the request */
curl_easy_perform(curl);
}
Added in 7.85.0
Returns CURLE_UNKNOWN_OPTION if the option is not implemented,
CURLE_UNSUPPORTED_PROTOCOL if a listed protocol is not supported or disabled,
CURLE_BAD_FUNCTION_ARGUMENT if no protocol is listed else CURLE_OK.
CURLOPT_REDIR_PROTOCOLS_STR(3),
CURLOPT_URL(3),
curl_version_info(3),
CURLINFO_SCHEME(3),