title: POST using CURL in PHP gives invalid request Error
body: <p>I am using below post method for google account using curl but it gives me invalid_request error.</p>
  
  <pre><code>POST /o/oauth2/token HTTP/1.1
  Host: accounts.google.com
  Content-Type: application/x-www-form-urlencoded
  
  code=4/ux5gNj-_mIu4DOD_gNZdjX9EtOFf&amp;
  client_id=1084945748469-eg34imk572gdhu83gj5p0an9fut6urp5.apps.googleusercontent.com&amp;
  client_secret=CENSORED&amp;
  redirect_uri=http://localhost/oauth2callback&amp;
  grant_type=authorization_code
  </code></pre>
  
  <p>Here is my PHP code with curl </p>
  
  <pre><code>$text ='test';
  
  $URL = "https://accounts.google.com/o/oauth2/token";
  
  $header = array(
  "POST /o/oauth2/token HTTP/1.1",
  "Host: accounts.google.com",
  "Content-type: application/atom+xml;charset=\"utf-8\"",
  "Accept: text/xml",
  "Cache-Control: no-cache", 
  "code=[my_code]&amp;client_id=[my_client_id]&amp;client_secret=[my_client_secret]&amp; redirect_uri=http://localhost/curl_resp.php&amp;grant_type=authorization_code",
  "Content-length: ".strlen($text),
  );
  
  
   $xml_do = curl_init();
   curl_setopt($xml_do, CURLOPT_URL, $URL);
   curl_setopt($xml_do, CURLOPT_CONNECTTIMEOUT, 10);
   curl_setopt($xml_do, CURLOPT_TIMEOUT, 10);
   curl_setopt($xml_do, CURLOPT_RETURNTRANSFER, true);
   curl_setopt($xml_do, CURLOPT_SSL_VERIFYPEER, false);
   curl_setopt($xml_do, CURLOPT_SSL_VERIFYHOST, false);
   curl_setopt($xml_do, CURLOPT_POST, false);
   curl_setopt($xml_do, CURLOPT_POSTFIELDS, $text);
   curl_setopt($xml_do, CURLOPT_HTTPHEADER, $header);
  </code></pre>
  
  <p>And I am having invalid request error </p>