Empty responseText from XMLHttpRequest

Question

I have written an XMLHttpRequest which runs fine but returns an empty responseText   The javascript is as follows     var anUrl    http   api xxx com rates csv rates txt     var myRequest   new XMLHttpRequest       callAjax anUrl      function callAjax url         myRequest open  GET   url  true        myRequest onreadystatechange   responseAjax                   myRequest setRequestHeader  Cache-Control    no-cache         myRequest send null          function responseAjax          if myRequest readyState    4            if myRequest status    200                result   myRequest responseText              alert result               alert  we made it              else               alert    An error has occurred      myRequest statusText                          The code runs fine  I can walk through and I get the readyState    4 and a status    200 but the responseText is always blank   I am getting a log error  in Safari debug  of Error dispatching  getProperties which I cannot seem to find reference to    I have run the code in Safari and Firefox both locally and on a remote server   The URL when put into a browser will return the string and give a status code of 200   I wrote similar code to the same URL in a Mac Widget which runs fine  but the same code in a browser never returns a result

User · Answer

PROBLEM RESOLVED  In my case the problem was that I do the ajax call  with   ajax    get or   getJSON methods from jQuery  with full path in the url param         url   http   mydomain com site cgi-bin serverApp php    But the correct way is to pass the value of url as      url   site cgi-bin serverApp php    Some browser don t conflict and make no distiction between one text or another  but in Firefox 3 6 for Mac OS take this full path as  cross site scripting     another thing  in the same browser there is a distinction between   http   mydomain com site index html   And put  http   www mydomain com site index html  In fact it is the correct point view  but most implementations make no distinction  so the solution was to remove all the text that specify the full path to the script in the methods that do the ajax request AND     remove any BASE tag in the index html file  base href  http   mydomain com      lt --- bad idea  remove it   If you don t remove it  this version of browser for this system may take your ajax request like if it is a cross site request                  I have the same problem but only on the Mac OS machine  The problem is that Firefox treat the ajax response as an  cross site  call  in any other machine browser it works fine  I didn t found any help about this  I think that is a firefox implementation issue   but I m going to prove the next code at the server side   header  Content-type  application json                  to ensure that browser get the data as  json data

User · Answer

The browser is preventing you from cross-site scripting   If the url is outside of your domain  then you need to do this on the server side or move it into your domain

User · Answer

Is http   api xxx com  part of your domain  If not  you are being blocked by the same origin policy   You may want to check out the following Stack Overflow post for a few possible workarounds    Ways to circumvent the same-origin policy

User · Answer

This might not be the best way to do it  But it somehow worked for me  so i m going to run with it   In my php function that returns the data  one line before the return line  I add an echo statement  echoing the data I want to send   Now sure why it worked  but it did

User · Answer

Had a similar problem to yours  What we had to do is use the document domain solution found here   Ways to circumvent the same-origin policy  We also needed to change thins on the web service side  Used the  Access-Control-Allow-Origin  header found here   https   developer mozilla org En HTTP access control

[javascript] Empty responseText from XMLHttpRequest

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