title: CSRF Failed when POST data using Alamofire
body: <p>I using django-reat-framework as backend and using SessionAuthentication and TokenAuthentication.
  This work well when I use httpie send request</p>
  
  <p><code>http POST http://127.0.0.1:8000/api/users/ email="abc@abc.com" user_name="abc" passwod="1234"</code></p>
  
  <p>but when I use Alamofire</p>
  
  <pre><code>Alamofire.request(.POST, "http://127.0.0.1:8000/api/users/", parameters: ["email": emailField.text!, "user_name": usernameField.text!, "password": passwordField.text!], encoding: .URL )
              .responseJSON { response in
                  print(response.request)  // original URL request
                  print(response.response) // URL response
                  print(response.data)     // server data
                  print(response.result)
                  if let JSON = response.result.value {
                      print("JSON: \(JSON)")
                  }
          }
  </code></pre>
  
  <p>return this</p>
  
  <pre><code>Optional(&lt;NSMutableURLRequest: 0x7fe24e15d640&gt; { URL: http://127.0.0.1:8000/api/users/ })
  Optional(&lt;NSHTTPURLResponse: 0x7fe24bf3a080&gt; { URL: http://127.0.0.1:8000/api/users/ } { status code: 403, headers {
      Allow = "GET, POST, HEAD, OPTIONS";
      "Content-Type" = "application/json";
      Date = "Fri, 11 Mar 2016 13:09:59 GMT";
      Server = "WSGIServer/0.2 CPython/3.4.3";
      Vary = "Accept, Cookie";
      "X-Frame-Options" = SAMEORIGIN;
  } })
  Optional(&lt;7b226465 7461696c 223a2243 53524620 4661696c 65643a20 43535246 20746f6b 656e206d 69737369 6e67206f 7220696e 636f7272 6563742e 227d&gt;)
  SUCCESS
  JSON: {
      detail = "CSRF Failed: CSRF token missing or incorrect.";
  }
  </code></pre>
  
  <p>But 127.0.0.1:8000/api/users/ don't need any permission, and I didn't send csrf token when I using httpie.So, What's wrong here?</p>