HTTP Error 400. There is an invalid content length or chunk length in the request

Question

This is an auto promotion system (written in php) for a website, however it seems to give an error that I'm not familiar with. I replaced the website name with 'example' for privacy reasons.

<?php
$group_id         = $_GET['groupId'];
$new_role_set_id  = $_GET['newRoleSetId'];
$target_user_id   = $_GET['targetUserId'];


$login_user       = 'username=user&password=pass';
$file_path_rs     = 'rs.txt';
$file_path_token  = 'token.txt';
$current_rs       = file_get_contents($file_path_rs);
$current_token    = file_get_contents($file_path_token);


function getRS()
{
    global $login_user, $file_path_rs;

    $get_cookies = curl_init('https://www.example.com/newlogin');
    curl_setopt_array($get_cookies,
        array(
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HEADER => true,
            CURLOPT_POST => true,
            // CURLOPT_HTTPHEADER => array("Content-Length: " . strlen($login_user)),
            CURLOPT_POSTFIELDS => $login_user
        )
    );

    $rs = (preg_match('/(\.SECURITY=.*?);/', curl_exec($get_cookies), $matches) ? $matches[1] : '');
    file_put_contents($file_path_rs, $rs, true);
    curl_close($get_cookies);

    return $rs;
}


function changeRank($rs, $token) 
{
    global $group_id, $new_role_set_id, $target_user_id, $file_path_token;

    $promote_user = curl_init("http://www.example.com/groups/api/change-member-rank?groupId=$group_id&newRoleSetId=$new_role_set_id&targetUserId=$target_user_id");
    curl_setopt_array($promote_user,
        array(
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST => true,
            CURLOPT_HEADER => true,
            CURLOPT_HTTPHEADER => array("Cookie: $rs", "X-CSRF-TOKEN: $token")
        )
    );

    $resp = curl_exec($promote_user);
    $resp_header_size = curl_getinfo($promote_user, CURLINFO_HEADER_SIZE);
    $resp_header = substr($resp, 0, $resp_header_size);
    $resp_body = substr($resp, $resp_header_size);

    if (preg_match('/GuestData/', $resp_header)) {

        $resp_body = changeRank( getRS(), $token );
    } else if (preg_match('/Token Validation Failed/', $resp_header)) {

        $new_token = (preg_match('/X-CSRF-TOKEN: (\S+)/', $resp_header, $matches) ? $matches[1] : '');
        file_put_contents($file_path_token, $new_token, true);
        $resp_body = changeRank( $rs, $new_token );
    }

    curl_close($promote_user);

    return $resp_body;
}


echo changeRank($current_rs, $current_token);

When accessing the page I get the page error:

Bad Request - Invalid Content Length

HTTP Error 400. There is an invalid content length or chunk length in the request.

I'm not sure why this is happening, and I've tried just about everything, even switching hosts, but the issue still arises. What can I do to fix this?

Answer 1

It may be that within the changeRank() function you are doing a POST request with no data. Try adding curl_setopt($ch, CURLOPT_POSTFIELDS, array()); before the curl_exec().

Or you can add it to your curl_setopt_array() declaration.