Could not handle 301/302 redirect probably.

[KawaiiZapic]

When a target of a link try to make a 301/302 redirect to other site that not in this domain,PJAX will also try to request it and blocked by the browser for security reason.
And user will not get a probably redirect.

For an example:
On http://www.example.com/index.html ,there is a link to http://www.example.com/login.html .
But the login.html made a 301 redirect to http://login.example.net/login.php ,and this script could not redirect to login.php probably.

[iangreenleaf]

I just ran into this recently. It's a tough one because browsers handle redirects transparently in XmlHttpRequest, so the PJAX JS can't stop the request from going to the external URL (and probably erroring on a CORS failure). To fix this without server modifications, I think this script would need to migrate to the fetch API, which has more control over redirect behavior.

Because I do have control over my server, I was able to work around it as follows:

1. On the server, when redirecting I check for the x-pjax header. If it's present, instead of returning a 301/302 I return a 204 with a x-pjax-location header set (the name of this header can be anything, I'm the only one using it).
2. On the client, I added this:

     pjax._handleResponse = pjax.handleResponse;
   
     pjax.handleResponse = function(responseText, request, href, options) {
       var redirect = request.getResponseHeader("x-pjax-location")
       if (redirect) {
         window.location = redirect
       } else {
         pjax._handleResponse(responseText, request, href, options);
       }
     }