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CURLOPT_REDIR_PROTOCOLS_STR(3) curl_easy_setopt options
CURLOPT_REDIR_PROTOCOLS_STR - protocols allowed to redirect to
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REDIR_PROTOCOLS_STR,
Pass a pointer to a string that holds a comma-separated list of case
insensitive protocol names (URL schemes). That list limits what
protocols libcurl may use in a transfer that it follows to in a
redirect when CURLOPT_FOLLOWLOCATION(3) is enabled. This option allows
applications to limit specific transfers to only be allowed to use a
subset of protocols in redirections.
Protocols denied by CURLOPT_PROTOCOLS_STR(3) are not overridden by this
By default libcurl will allow HTTP, HTTPS, FTP and FTPS on redirects
(since 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
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.
If trying to set a non-existing protocol or if no matching protocol at
all is set, it returns error.
HTTP, HTTPS, FTP and FTPS (Added in 7.65.2).
Older versions defaulted to all protocols except FILE, SCP and since
7.40.0 SMB and SMBS.
curl = curl_easy_init();
/* pass in the URL from an external source */
curl_easy_setopt(curl, CURLOPT_URL, argv);
/* only allow redirects to HTTP and HTTPS URLs */
curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS_STR, "http,https");
/* Perform the request */
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
libcurl 7.87.0 September 13, 2022