javascript - How to detect a server redirect with $.get() - Stack Overflow

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No Duplicate Question

This question is not a duplicate of one of the above mentioned, since I have no control over the server response as it is the case in the other two questions above.

---

I use $.get to load the content of an external document into the current website.

However, I need the final URL of this external document. In the case, where the original URL gets redirected (302) to a different URL, I need the new URL.

Can I get the final URL from the loaded document (after 302 redirect) using the jQuery $.get method?

---

Update

Based on the feedback below, I updated my code to this, but I still don't get the final URL:

$.get(url, function(html, status, xhr){
    console.log(xhr.getResponseHeader('TM-finalURL')); // result: null
});

---

Logging all response headers with xhr.getAllResponseHeaders() gives me (for a page with 302 redirect) the following result:

Pragma: no-cache
Date: Fri, 28 Feb 2014 15:30:22 GMT
Server: Apache
X-Powered-By: PHP/5.3.28
Transfer-Encoding: chunked
Content-Type: text/html
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Connection: Keep-Alive
Keep-Alive: timeout=15, max=100
Expires: Thu, 19 Nov 1981 08:52:00 GMT

But no final URL. Did I understand something wrong here?

No Duplicate Question

This question is not a duplicate of one of the above mentioned, since I have no control over the server response as it is the case in the other two questions above.

---

I use $.get to load the content of an external document into the current website.

However, I need the final URL of this external document. In the case, where the original URL gets redirected (302) to a different URL, I need the new URL.

Can I get the final URL from the loaded document (after 302 redirect) using the jQuery $.get method?

---

Update

Based on the feedback below, I updated my code to this, but I still don't get the final URL:

$.get(url, function(html, status, xhr){
    console.log(xhr.getResponseHeader('TM-finalURL')); // result: null
});

---

Logging all response headers with xhr.getAllResponseHeaders() gives me (for a page with 302 redirect) the following result:

Pragma: no-cache
Date: Fri, 28 Feb 2014 15:30:22 GMT
Server: Apache
X-Powered-By: PHP/5.3.28
Transfer-Encoding: chunked
Content-Type: text/html
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Connection: Keep-Alive
Keep-Alive: timeout=15, max=100
Expires: Thu, 19 Nov 1981 08:52:00 GMT

But no final URL. Did I understand something wrong here?

• javascript
• jquery
• url
• http-redirect

Share Improve this question Follow edited May 28, 2014 at 22:09 Simon Ferndriger asked Feb 28, 2014 at 10:22 Simon FerndrigerSimon Ferndriger 4,96266 gold badges3333 silver badges6262 bronze badges 17

• 1 check using: success: function(data, status, xhr) { console.log(xhr.getAllResponseHeaders()); } then try: xhr.getResponseHeader(key) I'm not sure which 'key' should be targeted for a redirection – A. Wolff Commented Feb 28, 2014 at 10:29
• 1 ^^ that - jqXHR.getResponseHeader("TM-finalURL") (I believe) – Reinstate Monica Cellio Commented Feb 28, 2014 at 10:30
• @Archer no, my bad, didn't read enough your previous ment – A. Wolff Commented Feb 28, 2014 at 10:33
• 3 Then you have no way to detect the redirect. It is handled pletely transparently to JavaScript. – Quentin Commented Feb 28, 2014 at 15:42
• 1 @SimonFerndriger As the others have stated, it's not possible, as it happens way before javascript is ever notified. Usually this is solved by detecting server side, that it is a ajax call, and send a header out to tell it to redirect. If it is a single page that it is always redirected to(think login page), you can do a very dirty fix, and check the return content for some determinant, that it is now on the login page. But I do NOT remend this. – André Snede Commented Mar 3, 2014 at 9:18

 |  Show 12 more ments

1 Answer 1

Sorted by: Reset to default 11 +50

Looking at the XHR specification, you can see that it is not built to be flexible. All redirects are handled transparently:

If the response has an HTTP status code of 301, 302 ... transparently follow the redirect

No events are ever triggered in JavaScript with the intermediate status codes. JavaScript will only be notified of the final HTTP status and the data returned, as this is what is supposed to be made available:

Once all HTTP headers have been received, the synchronous flag is unset, and the HTTP status code of the response is not one of 301, 302, 303, 307, and 308

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