---
name: "CURLOPT_POSTREDIR"
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_POSTREDIR"
---

# CURLOPT\_POSTREDIR(3)

how to act on an HTTP POST redirect

## NAME

CURLOPT\_POSTREDIR - how to act on an HTTP POST redirect

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTREDIR,
                          long bitmask);
```

## DESCRIPTION

Pass a bitmask to control how libcurl acts on redirects after POSTs that get a 301, 302 or 303 response back. A parameter with bit 0 set (value **CURL\_REDIR\_POST\_301**) tells the library to respect RFC 7231 (section 6.4.2 to 6.4.4) and not convert POST requests into GET requests when following a 301 redirection. Setting bit 1 (value **CURL\_REDIR\_POST\_302**) makes libcurl maintain the request method after a 302 redirect whilst setting bit 2 (value **CURL\_REDIR\_POST\_303**) makes libcurl maintain the request method after a 303 redirect. The value **CURL\_REDIR\_POST\_ALL** is a convenience define that sets all three bits.

The non-RFC behavior is ubiquitous in web browsers, so the library does the conversion by default to maintain consistency. However, a server may require a POST to remain a POST after such a redirection. This option is meaningful only when setting *[CURLOPT\_FOLLOWLOCATION(3)](/CURLOPT_FOLLOWLOCATION/3.md)*.

## DEFAULT

0

## PROTOCOLS

HTTP(S)

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    /* a silly POST example */
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "data=true");
    /* example.com is redirected, so we tell libcurl to send POST on 301,
       302 and 303 HTTP response codes */
    curl_easy_setopt(curl, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
    curl_easy_perform(curl);
  }
}
```

## AVAILABILITY

Added in 7.17.1. This option was known as CURLOPT\_POST301 up to 7.19.0 as it only supported the 301 then. CURL\_REDIR\_POST\_303 was added in 7.26.0.

## RETURN VALUE

Returns CURLE\_OK if the option is supported, and CURLE\_UNKNOWN\_OPTION if not.

## SEE ALSO

[**CURLINFO\_EFFECTIVE\_METHOD**(3)](/CURLINFO_EFFECTIVE_METHOD/3.md), [**CURLINFO\_REDIRECT\_COUNT**(3)](/CURLINFO_REDIRECT_COUNT/3.md), [**CURLOPT\_FOLLOWLOCATION**(3)](/CURLOPT_FOLLOWLOCATION/3.md), [**CURLOPT\_MAXREDIRS**(3)](/CURLOPT_MAXREDIRS/3.md), [**CURLOPT\_POSTFIELDS**(3)](/CURLOPT_POSTFIELDS/3.md)