Cannot read fraqment parameters from url

Question

I am working on integration with vk.com. Their documentation says that you will be redirected after authorization to next url

http://REDIRECT_URI#access_token= 533bacf01e11f55b536a565b57531ad114461ae8736d6506a3&expires_in=86400&user_id=8492

And redirect happens but I don't see access_token, expires_in and user_id variables. I investigated HttpContext and didn't find these parameters. This HttpContext.Request.Url just shows me my url without #access_token= 533bacf01e11f55b536a565b57531ad114461ae8736d6506a3&expires_in=86400&user_id=8492

But if I replace # character with ? in url it works as expected.

I am working with vk api from ASP.NET MVC. Does anybody know how to get these parameters?

The browser doesn't send the fragment (anything that comes after the `#` in the url) to the server. re-read the API documentation carefully. — haim770, Dec 04 '13 at 08:10
This is documentation http://vk.com/dev/auth_mobile I read it many times. Docs on Russian — Radislav, Dec 04 '13 at 08:13

score 1 · Accepted Answer · edited May 23 '17 at 12:13

It's not possible to read fragment since it's not send to server (and VK probably do this for improved security of auth process) your option is to use JavaScript:

<script>
  if(window.location.hash) {
      //Puts hash in variable, and removes the # character
      var hash = window.location.hash.substring(1); 
      // hash found
      alert (hash);
  } else {
      // No hash found
  }
</script>

giammin · Answer 2 · 2013-12-04T09:14:54.333

0

Sadly the Fragment is not passed to the server.

It will always be empty when you attempt to get it from a Request.Uri.Fragment.

There is no easy way to get the fragment on the server. You have to use javascript to retrieve the fragment and send it to the server maybe with AJAX or you can create a middle page that read fragment and redirect the user to another page with the fragment replaced with querystrings.

The middle page could be something like:

if(window.location.hash) {
    window.location= '/yoururl.htm' + window.location.hash.replace('#','?');
}

edited Dec 04 '13 at 09:14

answered Dec 04 '13 at 07:59

giammin

18,620
8
71
89

Request.Url.Fragment returns "". :( – Radislav Dec 04 '13 at 08:03
The browser doesn't send the fragment to the server. it is useful only when you parse the full URI: `new Uri("http://www.my.com/home#frag").Fragment` – haim770 Dec 04 '13 at 08:07
@Radislav browser used? – giammin Dec 04 '13 at 08:10
1

Yes, I am using browser. – Radislav Dec 04 '13 at 08:10
Google Chrome. I am not sure that it make sence. I will test with firefox and IE 11. – Radislav Dec 04 '13 at 08:23
The same result with IE11 and firefox – Radislav Dec 04 '13 at 08:26

Cannot read fraqment parameters from url

2 Answers2