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deps/curl/docs/libcurl/opts/CURLOPT_POSTREDIR.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_POSTREDIR
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_EFFECTIVE_METHOD (3)
+  - CURLINFO_REDIRECT_COUNT (3)
+  - CURLOPT_FOLLOWLOCATION (3)
+  - CURLOPT_MAXREDIRS (3)
+  - CURLOPT_POSTFIELDS (3)
+---
+
+# NAME
+
+CURLOPT_POSTREDIR - how to act on an HTTP POST redirect
+
+# SYNOPSIS
+
+~~~c
+#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).
+
+# DEFAULT
+
+0
+
+# PROTOCOLS
+
+HTTP(S)
+
+# EXAMPLE
+
+~~~c
+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.