jQuery and AJAX response header

Question

So I ve got this jQuery AJAX call  and the response comes from the server in the form of a 302 redirect  I d like to take this redirect and load it in an iframe  but when I try to view the header info with a javascript alert  it comes up null  even though firebug sees it correctly   Here s the code  if it ll help    j ajax       type   POST       url  url do       data  formData      complete  function resp           alert resp getAllResponseHeaders                 I don t really have access to the server-side stuff in order to move the URL to the response body  which I know would be the easiest solution  so any help with the parsing of the header would be fantastic

User · Answer

var geturl    geturl     ajax       type   GET       url   http              success  function            alert  done    geturl getAllResponseHeaders

User · Answer

1 to PleaseStand and here is my other hack     after searching and found that the  cross ajax request  could not get response headers from XHR object  I gave up   and use iframe instead     1   lt iframe style  display none  gt  lt  iframe gt  2     iframe   attr  src    http   the url you want to access     this is my aim    3     iframe   contents   find   someID   html

User · Answer

The unfortunate truth about AJAX and the 302 redirect is that you can t get the headers from the return because the browser never gives them to the XHR   When a browser sees a 302 it automatically applies the redirect   In this case  you would see the header in firebug because the browser got it  but you would not see it in ajax  because the browser did not pass it   This is why the success and the error handlers never get called   Only the complete handler is called     http   www checkupdown com status E302 html  The 302 response from the Web server should always include an alternative URL to which redirection should occur  If it does  a Web browser will immediately retry the alternative URL  So you never actually see a 302 error in a Web browser   Here are some stackoverflow posts on the subject   Some of the posts describe hacks to get around this issue     How to manage a redirect request after a jQuery Ajax call  Catching 302 FOUND in JavaScript   HTTP redirect  301  permanent  vs  302  temporary

User · Answer

The underlying XMLHttpRequest object used by jQuery will always silently follow redirects rather than return a 302 status code  Therefore  you can t use jQuery s AJAX request functionality to get the returned URL  Instead  you need to put all the data into a form and submit the form with the target attribute set to the value of the name attribute of the iframe       myIframe   attr  name    myIframe     var form       lt form method  POST  action  url do  gt  lt  form gt    attr  target    myIframe        lt input type  hidden    gt    attr  name   search   value   test    appendTo form    form appendTo document body   form submit      The server s url do page will be loaded in the iframe  but when its 302 status arrives  the iframe will be redirected to the final destination

User · Answer

try this   type   GET   async  false  complete  function  XMLHttpRequest  textStatus        var headers   XMLHttpRequest getAllResponseHeaders

User · Answer

cballou s solution will work if you are using an old version of jquery  In newer versions you can also try       ajax      type   POST      url  url do      data  formData     success  function data  textStatus  request           alert request getResponseHeader  some header              error  function  request  textStatus  errorThrown            alert request getResponseHeader  some header                  According to docs the XMLHttpRequest object is available as of jQuery 1 4

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If this is a CORS request  you may see all headers in debug tools  such as Chrome- Inspect Element- Network   but the xHR object will only retrieve the header  via xhr getResponseHeader  Header    if such a header is a simple response header    Content-Type Last-modified Content-Language Cache-Control Expires Pragma   If it is not in this set  it must be present in the Access-Control-Expose-Headers header returned by the server   About the case in question  if it is a CORS request  one will only be able to retrieve the Location header through the XMLHttpRequest object if  and only if  the header below is also present   Access-Control-Expose-Headers  Location   If its not a CORS request  XMLHttpRequest will have no problem retrieving it

User · Answer

UPDATE 2018 FOR JQUERY 3 AND LATER  I know this is an old question but none of the above solutions worked for me  Here is the solution that worked     I only created this function as I am making many ajax calls with different urls and appending the result to different divs function makeAjaxCall requestType  urlTo  resultAreaId           var jqxhr     ajax               type  requestType              url  urlTo                       this section is executed when the server responds with no error          jqxhr done function                           this section is executed when the server responds with error         jqxhr fail function                          this section is always executed         jqxhr always function                console log  getting header     jqxhr getResponseHeader  testHeader

[jquery] jQuery and AJAX response header

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