XHR with no response headers, no timings - help?

[ja...@zendesk.com]

Hey everyone,

I'm having some trouble interpreting what I'm seeing in an export from Google Chrome's Developer Tools, and was hoping there might be someone who has seen this before and can tell me some possible causes.

Few notes:

1. I've had to redact a few bits of data here, but have no actually remove anything.
   
2. This XHR request usually goes through without an issue. In fact, later on in the HAR the call is made again and is a success
3. I know this didn't hit the URL, since I can't see anything in the access logs for this request. 
4. In a HAR viewer, this particular request looks like this: http://cl.ly/image/1Z1y232S2T1F
5. This is an AJAX call initiated by jQuery

    {

        "startedDateTime": "2013-02-16T16:06:47.484Z",

        "time": 42428,

        "request": {

          "method": "PUT",

          "url": "redacted",

          "httpVersion": "HTTP/1.1",

          "headers": [

            {

              "name": "Origin",

              "value": "Redacted"

            },

            {

              "name": "Cache-Control",

              "value": "no-cache"

            },

            {

              "name": "User-Agent",

              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.57 Safari/537.17"

            },

            {

              "name": "Content-Type",

              "value": "application/json"

            },

            {

              "name": "Pragma",

              "value": "no-cache"

            },

            {

              "name": "Accept",

              "value": "application/json, text/javascript, */*; q=0.01"

            },

            {

              "name": "Referer",

              "value": "Redacted"

            },

            {

              "name": "X-Requested-With",

              "value": "XMLHttpRequest"

            }

          ],

          "queryString": [],

          "cookies": [],

          "headersSize": 591,

          "bodySize": 725,

          "postData": {

            "mimeType": "application/json",

            "text": "Redacted"

          }

        },

        "response": {

          "status": 0,

          "statusText": "",

          "httpVersion": "HTTP/1.1",

          "headers": [],

          "cookies": [],

          "content": {

            "size": 0,

            "compression": 0

          },

          "redirectURL": "",

          "headersSize": 13,

          "bodySize": 0

        },

        "cache": {},

        "timings": {

          "blocked": 0,

          "dns": -1,

          "connect": -1,

          "send": -1,

          "wait": -1,

          "receive": null,

          "ssl": -1

        },

        "pageref": "page_1"

      },