php with Curl: follow redirect with POST

Question

I have a script that send POST data to several pages. however, I encountered some difficulties sending request to some servers. The reason is redirection. Here's the model:

I'am sending post request to server
Server responses: 301 Moved Permanently
Then curl_setopt ( $ch, CURLOPT_FOLLOWLOCATION, TRUE) kicks in and follows the redirection (but via GET request).

To solve this I'am using curl_setopt ( $ch, CURLOPT_CUSTOMREQUEST, "POST") and yes, now its redirecting without POST body content that I've send in first request. How can I force curl to send post body when redirected? Thanks!

Here's the example:

<?php 
function curlPost($url, $postData = "")
{
    $ch = curl_init () or exit ( "curl error: Can't init curl" );
    $url = trim ( $url );
    curl_setopt ( $ch, CURLOPT_URL, $url );
    //curl_setopt ( $ch, CURLOPT_POST, 1 );
    curl_setopt ( $ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt ( $ch, CURLOPT_POSTFIELDS, $postData );
    curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, true );
    curl_setopt ( $ch, CURLOPT_CONNECTTIMEOUT, 30 );
    curl_setopt ( $ch, CURLOPT_TIMEOUT, 30 );
    curl_setopt ( $ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.109 Safari/537.36");
    curl_setopt ( $ch, CURLOPT_FOLLOWLOCATION, TRUE);

    $response = curl_exec ( $ch );
    if (! $response) {
        echo "Curl errno: " . curl_errno ( $ch ) . " (" . $url . " postdata = $postData )\n";
        echo "Curl error: " . curl_error ( $ch ) . " (" . $url . " postdata = $postData )\n";
        $info = curl_getinfo($ch);
        echo "HTTP code: ".$info["http_code"]."\n";
        // exit();
    }
    curl_close ( $ch );
    // echo $response;
    return $response;
}
?>

put your php code in post with example

Chetan Ameta
– Chetan Ameta

2016-02-12 10:06:16 +00:00
Commented Feb 12, 2016 at 10:06 — Chetan Ameta
– Chetan Ameta, Commented Feb 12, 2016 at 10:06

Community · Accepted Answer · 2021-10-07 07:59:29Z

14

curl is following what RFC 7231 suggests, which also is what browsers typically do for 301 responses:

  Note: For historical reasons, a user agent MAY change the request
  method from POST to GET for the subsequent request.  If this
  behavior is undesired, the 307 (Temporary Redirect) status code
  can be used instead.

If you think that's undesirable, you can change it with the CURLOPT_POSTREDIR option, which only seems very sparsely documented in PHP but the libcurl docs explains it. By setting the correct bitmask there, you then make curl not change method when it follows the redirect.

If you control the server end for this, an easier fix would be to make sure a 307 response code is returned instead of a 301.

edited Oct 7, 2021 at 7:59

CommunityBot

11 silver badge

answered Feb 12, 2016 at 10:13

Daniel Stenberg

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1 Comment

Александр Пушкин Over a year ago

Wow, thanks. Didn't find anything on the net about this. Also, php says: "Notice: Use of undefined constant CURL_REDIR_POST_ALL" so there is no this constant defind and I just used curl_setopt ( $ch, CURLOPT_POSTREDIR, 3). It works nice now. Thanks again, your pretty good!

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