---
name: "CURLOPT_REDIR_PROTOCOLS_STR"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_REDIR_PROTOCOLS_STR"
---

# CURLOPT\_REDIR\_PROTOCOLS\_STR(3)

protocols allowed to redirect to

## 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 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)](/CURLOPT_FOLLOWLOCATION/3.md)* 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)](/CURLOPT_PROTOCOLS_STR/3.md)* 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.

## 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

All

## 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 7.85.0.

## RETURN VALUE

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.

## SEE ALSO

[**CURLINFO\_SCHEME**(3)](/CURLINFO_SCHEME/3.md), [**CURLOPT\_DEFAULT\_PROTOCOL**(3)](/CURLOPT_DEFAULT_PROTOCOL/3.md), [**CURLOPT\_PROTOCOLS**(3)](/CURLOPT_PROTOCOLS/3.md), [**CURLOPT\_PROTOCOLS\_STR**(3)](/CURLOPT_PROTOCOLS_STR/3.md), [**CURLOPT\_REDIR\_PROTOCOLS**(3)](/CURLOPT_REDIR_PROTOCOLS/3.md)