CURLOPT_REDIR_PROTOCOLS − set protocols allowed to redirect to
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REDIR_PROTOCOLS, long bitmask);
Pass a long that holds a bitmask of CURLPROTO_* defines. If used, this bitmask limits what protocols libcurl may use in a transfer that it follows to in a redirect when CURLOPT_FOLLOWLOCATION(3) is enabled. This allows you to limit specific transfers to only be allowed to use a subset of protocols in redirections.
Protocols denied by CURLOPT_PROTOCOLS(3) are not overridden by this option.
By default libcurl will allow HTTP, HTTPS, FTP and FTPS on redirect (7.65.2). Older versions of libcurl allowed all protocols on redirect except several disabled for security reasons: Since 7.19.4 FILE and SCP are disabled, and since 7.40.0 SMB and SMBS are also disabled. CURLPROTO_ALL enables all protocols on redirect, including those disabled for security.
These are the
available protocol defines:
HTTP, HTTPS, FTP and FTPS (Since 7.65.2).
Older versions defaulted to all protocols except FILE, SCP and since 7.40.0 SMB and SMBS.
/* pass in the URL from an external source */
curl_easy_setopt(curl, CURLOPT_URL, argv);
/* only allow
redirects to HTTP and HTTPS URLs */
CURLPROTO_HTTP | CURLPROTO_HTTPS);
/* Perform the
Added in 7.19.4, before then it would follow all protocols.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.