Section: curl_easy_setopt options (3)
Updated: December 31, 2020
CURLOPT_POSTREDIR - how to act on an HTTP POST redirect
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTREDIR,
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
) 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
libcurl maintain the request method after a 302 redirect whilst setting bit 2
) 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).
CURL *curl = curl_easy_init();
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);
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.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.