How to get a cookie from an AJAX response

Question

I have a   ajax request on the same domain and I want to read the cookie  It keeps returning null     ajax       type   GET       url  myUrl      success  function output  status  xhr            alert xhr getResponseHeader  MyCookie                cache  false       Any ideas  I m using Chrome for this

User · Accepted Answer

You re looking for a response header of Set-Cookie  xhr getResponseHeader  Set-Cookie     It won t work with HTTPOnly cookies though  Update According to the XMLHttpRequest Level 1 and XMLHttpRequest Level 2  this particular response headers falls under the  quot forbidden quot  response headers that you can obtain using getResponseHeader    so the only reason why this could work is basically a  quot naughty quot  browser

User · Answer

The browser cannot give access to 3rd party cookies like those received from ajax requests for security reasons  however it takes care of those automatically for you   For this to work you need to   1  login with the ajax request from which you expect cookies to be returned     ajax  https   example com v2 login          method   POST        data   login id  user  password  password        crossDomain  true       success  login success       error  login error         2  Connect with xhrFields    withCredentials  true   in the next ajax request s  to use the credentials saved by the browser    ajax  https   example com v2 whatever          method   GET        xhrFields    withCredentials  true         crossDomain  true       success  whatever success       error  whatever error         The browser takes care of these cookies for you even though they are not readable from the headers nor the document cookie

User · Answer

Similar to yebmouxing I could not the    xhr getResponseHeader  Set-Cookie      method to work  It would only return null even if I had set HTTPOnly to false on my server   I too wrote a simple js helper function to grab the cookies from the document  This function is very basic and only works if you know the additional info  lifespan  domain  path  etc  etc   to add yourself   function getCookie cookieName     var cookieArray   document cookie split         for var i 0  i lt cookieArray length  i         var cookie   cookieArray i       while  cookie charAt 0               cookie   cookie substring 1             cookieHalves   cookie split           if cookieHalves 0    cookieName         return cookieHalves 1               return

User · Answer

xhr getResponseHeader  Set-Cookie      It won t work for me   I use this  function getCookie cname        var name   cname            var ca   document cookie split           for var i 0  i lt ca length  i              var c   ca i           while  c charAt 0        c   c substring 1           if  c indexOf name     -1  return c substring name length c length             return         success  function output  status  xhr        alert getCookie  MyCookie          http   www w3schools com js js cookies asp

[jquery] How to get a cookie from an AJAX response?

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