How to include Authorization header in cURL POST HTTP Request in PHP?

I'm trying to access mails of a user through Gmails OAuth 2.0, and I'm figuring this out through Google's OAuth 2.0 Playground

Here, they've specified I need to send this as a HTTP REQUEST:

POST /mail/feed/atom/ HTTP/1.1
Content-length: 0
Content-type: application/json
Authorization: OAuth SomeHugeOAuthaccess_tokenThatIReceivedAsAString

I've tried writing a code to send this REQUEST like this:

$crl = curl_init();
$header[] = 'Content-length: 0 
Content-type: application/json';

curl_setopt($crl, CURLOPT_HTTPHEADER, $header);
curl_setopt($crl, CURLOPT_POST,       true);
curl_setopt($crl, CURLOPT_POSTFIELDS, urlencode($accesstoken));

$rest = curl_exec($crl);


Not working, please help. :)

UPDATE: I took Jason McCreary's advice and now my code looks like this:

$crl = curl_init();

$headr = array();
$headr[] = 'Content-length: 0';
$headr[] = 'Content-type: application/json';
$headr[] = 'Authorization: OAuth '.$accesstoken;

curl_setopt($crl, CURLOPT_HTTPHEADER,$headr);
curl_setopt($crl, CURLOPT_POST,true);
$rest = curl_exec($crl);



But I'm not getting any output out of this. I think cURL is silently failing somewhere. Please do help. :)

UPDATE 2: NomikOS's trick did it for me. :) :) :) Thank you!!


@jason-mccreary is totally right. Besides I recommend you this code to get more info in case of malfunction:

$rest = curl_exec($crl);

if ($rest === false)
    // throw new Exception('Curl error: ' . curl_error($crl));
    print_r('Curl error: ' . curl_error($crl));



To debug you can set CURLOPT_HEADER to true to check HTTP response with firebug::net or similar.

curl_setopt($crl, CURLOPT_HEADER, true);


About Curl error: SSL certificate problem, verify that the CA cert is OK try adding this headers (just to debug, in a production enviroment you should keep these options in true):

curl_setopt($crl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($crl, CURLOPT_SSL_VERIFYPEER, false);

You have most of the codeā€¦

CURLOPT_HTTPHEADER for curl_setopt() takes an array with each header as an element. You have one element with multiple headers.

You also need to add the Authorization header to your $header array.

$header = array();
$header[] = 'Content-length: 0';
$header[] = 'Content-type: application/json';
$header[] = 'Authorization: OAuth SomeHugeOAuthaccess_tokenThatIReceivedAsAString';

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