title: Jquery AJAX POST call return 200 status OK but error
body: <p>Hi I have implemented one Ajax POST request to call web service. It always return 200 OK but execute failed event I have tried lot of things but I am not getting where I am doing mistake. I am adding my code here. <a href="http://fiddler2.com/">Fiddler</a> shows the response content but Ajax is not executing success event.</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;&lt;head&gt;
  &lt;script src="http://code.jquery.com/jquery-1.7.1.min.js" type="text/javascript"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;script type="text/javascript"&gt;
  
  $.ajax({
      type: "POST",
      url: url,
      data: values,
      dataType: 'json',
      cache: false,
      success: function (result) {
          alert("success:"+result);
      },
      error:function (error) {
          alert("error"+error);
      }
  });
  &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>I have tried dataType:'text'....response from server is in proper JSON format</p>
  
  <p>Request JSON data : </p>
  
  <pre><code>{
      "search": {
          "params_attributes": {
              "adults": "1",
              "children": "0",
              "depart_date": "2013-07-10",
              "destination_name": "OMS",
              "direct": "0",
              "infants": "0",
              "origin_name": "KUL",
              "range": "0",
              "trip_class": "0"
          }
      },
      "signature": "XXXXXXXX",
      "marker": "XXX"
  }
  </code></pre>
  
  <p>Response JSON data:</p>
  
  <pre><code>{
      "search_id":"66",
      "metadata" : {},
      "tickets" : [
          {
              "native_prices":{"7":"5500.0", "6":"5680.0", "3":"5657.0"},
              "order_urls":{"7":"1","6":"557","3":"906"},
              "direct_flights":[
                  {
                      "number":"1837",
                      "airline":"FV",
                      "departure":"1294037100",
                      "arrival":"1294041900",
                      "duration":"80",
                      "delay":"0",
                      "origin":"DME",
                      "destination":"LED",
                      "aircraft":"Airbus A319"
                  }
              ],
              "return_flights":[
                  {
                      "number":"1858",
                      "airline":"FV",
                      "departure":"1295503800",
                      "arrival":"1295508600",
                      "duration":"80",
                      "delay":"0",
                      "origin":"LED",
                      "destination":"DME",
                      "aircraft":"Airbus A320"
                  }
              ]
          }
      ],
         "airlines": {
            "AB": {
              "alliance_name": null,
              "average_rate": 3.84,
              "deeplink_id": 18,
              "homepage_id": "4ec0ff7b9f1c2760af0049d7",
              "id": 35,
              "name": "airberlin",
              "rates": 377
            },
            "AF": {
              "alliance_name": "SkyTeam",
              "average_rate": 2.89,
              "id": 48,
              "name": "Air France",
              "rates": 292
            }
          },
      "airports":{
            "ALA": {
              "average_rate": 3.66,
              "city": "\u0410\u043b\u043c\u0430\u0442\u044b",
              "country": "\u041a\u0430\u0437\u0430\u0445\u0441\u0442\u0430\u043d",
              "name": "\u0410\u043b\u043c\u0430\u0442\u044b",
              "rates": 60,
              "time_zone": "Asia/Almaty"
            },
            "AMM": {
              "average_rate": 3.42,
              "city": "\u0410\u043c\u043c\u0430\u043d",
              "country": "\u0418\u043e\u0440\u0434\u0430\u043d\u0438\u044f",
              "name": "Queen Alia International",
              "rates": 5,
              "time_zone": "Asia/Amman"
            }
      },
      "currency_rates":{"eur":"41.3564", "uah":"3.72911"},
          "gates_info": [
            {
              "average_rate": 4.34,
              "currency_code": "rub",
              "id": 1,
              "is_airline": false,
              "label": "Nabortu",
              "mobile_version": false,
              "payment_methods": [
                  "bank",
                  "yandex_money",
                  "web_money",
                  "terminal",
                  "card",
                  "svyaznoy",
                  "euroset"
              ],
              "rates": 336
            },
            {
              "average_rate": 4.34,
              "currency_code": "rub",
              "id": 2,
              "is_airline": false,
              "label": "Davs",
              "mobile_version": false,
              "payment_methods": [
                  "cash",
                  "bank",
                  "yandex_money",
                  "web_money",
                  "terminal",
                  "card",
                  "exp",
                  "euroset"
              ],
              "rates": 416
            }
          ]
  }
  </code></pre>
  
  <p>Ajax error: 
      {"readyState":0,"responseText":"","status":0,"statusText":"error"}</p>
  
  <p>I am adding screenshots which is taken from firebug please go to tinygrab url to see screenshot:</p>
  
  <pre><code>Headers - grab.by/on5Q
  Post - grab.by/on5U
  Response - grab.by/on5W
  Coockies - grab.by/on5Y
  </code></pre>