Yes, it is. You can see in the screen shot above that the response is simply “Server does not support the requested resource.” It’s not that the server is not able to process the request or that the client isn’t able to make the request. What’s happening is that your browser is redirecting the client to a server that isn’t capable of serving the response you need.
It is important to understand that the server is not necessarily a full server. The server could be a proxy server. A proxy server is a server that forwards requests to another server. The server in this case is doing the redirecting. The only difference between the server and the proxy server is that the server is also capable of serving a response.
A proxy server can serve more than one response. The server is requesting a specific URL to a specific response based on the client’s request. When the client makes a request for a specific URL, the server is told to return an empty response instead of a response. If the server returns an empty response, then the client gets a response that was requested, but not returned.
In response to this, it’s been suggested that the server could be served with response headers such as “X-Requested-With”, “X-CSRFToken”, “X-Server”, and even the content of the response itself.
The server may be using this to decide whether to serve content that is of interest to the user. In this case the client may be asking for a link for a page which contains a login form. In this case the server will return a response such as X-Requested-With: XMLHttpRequest, with the content of that response being an empty request-URI, as the server is not interested in that page.
The server is not interested in the page, yet the client wants the link. The problem here is that the client is requesting a URI that does not exist. In this case the server will send the same response as the original request, and the client will see the response as an error, and not know what to do next.
This is not a case of an HTTP response being invalid, but rather a case of the server not actually returning a response. The XMLHttpRequest response is invalid because the server is not interested in this page. The server should be telling the client to go back, but instead it’s simply sending a message back telling the client to go back.
A client may be able to infer the message of the server, so the client may be able to look like the server is telling it to go back. The client might only be able to find out about the server’s message because the client is on the same domain, but the client may not be able to decode the message.
The response is invalid because the server is not interested in this page. The server should be telling the client to go back, but instead its simply sending a message back telling the client to go back.A client may be able to infer the message of the server, so the client may be able to look like the server is telling it to go back.
The client may be able to decode the message from the server, but not the server’s message. The server might be sending you a message and the client is trying to find out what the server is sending it. A client may be able to decode the server’s message, but the server has not sent it to the client yet. The message might be the server telling the client to go back.