CURLOPT_RE...OTOCOLS_STR(3) Library Functions ManualCURLOPT_RE...OTOCOLS_STR(3)
NAME
CURLOPT_REDIR_PROTOCOLS_STR - protocols allowed to redirect to
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REDIR_PROTOCOLS_STR,
char *spec);
DESCRIPTION
Pass a pointer to a string that holds a comma-separated list of case in-
sensitive protocol names (URL schemes). That list limits what protocols
libcurl may use in a transfer that it follows to in a redirect when CUR-
LOPT_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
option.
By default libcurl allows HTTP, HTTPS, FTP and FTPS on redirects (since
7.65.2).
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.
Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to restore to internal default.
The application does not have to keep the string around after setting
this option.
DEFAULT
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.
PROTOCOLS
This functionality affects http only
EXAMPLE
int main(int argc, char **argv)
{
CURL *curl = curl_easy_init();
if(curl) {
/* pass in the URL from an external source */
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
/* only allow redirects to HTTP and HTTPS URLs */
curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS_STR, "http,https");
/* Perform the request */
curl_easy_perform(curl);
}
}
AVAILABILITY
Added in curl 7.85.0
RETURN VALUE
Returns CURLE_UNKNOWN_OPTION if the option is not implemented, CURLE_UN-
SUPPORTED_PROTOCOL if a listed protocol is not supported or disabled,
CURLE_BAD_FUNCTION_ARGUMENT if no protocol is listed else CURLE_OK.
SEE ALSO
CURLINFO_SCHEME(3), CURLOPT_DEFAULT_PROTOCOL(3), CURLOPT_PROTOCOLS(3),
CURLOPT_PROTOCOLS_STR(3), CURLOPT_REDIR_PROTOCOLS(3)
libcurl 2026-07-12 CURLOPT_RE...OTOCOLS_STR(3)
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