Napster Napster - 5 months ago 20
PHP Question

curl post file behind a proxy returns error

I am trying to post an image file to a server. Initially I tested my script without proxy at my home and it worked fine. But when I used the same script in my college it is throwing some error. The function for uploading images is as below

function upload($filepath,$dir)

$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_VERBOSE, 0);
curl_setopt($ch, CURLOPT_PROXY, 'localhost:7777');
curl_setopt($ch, CURLOPT_PROXYUSERPWD, 'ae07b026:kpack');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible;)");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_URL, '' );
$post_array = array(
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_array);
$response = curl_exec($ch);
echo $response;


and uploader.php is a normal file which just saves the image.

The error which I am getting is like this

The requested URL could not be retrieved

While trying to process the request:

POST /sites/scrap/uploader.php HTTP/1.1
Proxy-Authorization: Basic YWUwN2IwMjY6a3BhY2s=
User-Agent: Mozilla/4.0 (compatible;)
Accept: */*
Proxy-Connection: Keep-Alive
Content-Length: 87022
Expect: 100-continue
Content-Type: multipart/form-data; boundary=----------------------------07ae68105e71

The following error was encountered:

Invalid Request

Some aspect of the HTTP Request is invalid. Possible problems:

Missing or unknown request method
Missing URL
Missing HTTP Identifier (HTTP/1.0)
Request is too large
Content-Length missing for POST or PUT requests
Illegal character in hostname; underscores are not allowed

Your cache administrator is webmaster.
Generated Sun, 05 Jun 2011 17:26:33 GMT by (squid/2.7.STABLE7)


The problem is the proxy out institute using is "SQUID". And Squid doesn't support Expect: 100-continue.

So finally added this to my options

curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:'));

and its all working fine.