jQuery AJAX POST not working

Question

I am trying to post some data from one local asp.net mvc site to another but am unable to do so. I execute the following post on site A

// tried this and it didn't work      
//$.post("http://localhost/PlatformPortal/Buyers/Account/SignIn",
//{sign:authHeader})

// Currently trying this                  
    $.ajax({
             url: "http://localhost/PlatformPortal/Buyers/Account/SignIn",
             data: authHeader,
             type: "POST",
             success: function() { alert('Success!'); }
          })

I expected the POST "SignIn" action in the AccountController for SiteB to be hit, but it isn't. However, I do get the "Success!" popup message when I execute the post by clicking the link that the jquery snippet pasted above is wired to. Am I missing something ?

Answer 1

Since $.ajax() uses XMLHttpRequest, it is subject to XHR's cross-domain restriction.

Are your SiteA and SiteB on different hosts/ports? If so, you're seeing the expected behavior.