Why am I getting a HTTP 400 bad request error?

Question

<?php
$url ="http://absolutesms.com/Sendsms.aspx?userid=userid&password=password&clientid=clientid&senderid=absolute&mobilenumber=919000024365&smsmessage=SingleMessage".$request;
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$curl_scraped_page = curl_exec($ch);
curl_close($ch);
echo $curl_scraped_page;
?>

After running this code I am getting HTTP Error 400. The request is badly formed. What should I do? I tried other url they are working fine the only problem is with this. If I copy this url in browser it's working but it's giving error 400 when I put it and run it in curl.

Solution 1

I see this a lot. Usually fixed by running the request through urlencode().

Solution 2

Try building URL with http_build_query as below

$url = 'http://absolutesms.com/Sendsms.aspx?' . http_build_query(array(
    'userid' => $userid,
    'clientid' => $clientid,
///... continue
));

The problem is probably due to unescaped characters that have special meanings in URLs.

http_build_query escapes them for you safely.

Comments

[Michael Krelin - hacker]

The lack of & doesn't make URL invalid, even if it glues the next parameter to the last one. What is most likely to make url invalid is either its size or perhaps some awfully invalid characters.