Ajax for Web Application Developers

Handling Status Codes with an HTTP Object

HTTP status codes have a dual purpose: They are not only useful in the back end for development purposes, but they are also very useful on the front end for providing users with the status of their interactions.

As we briefly covered in Chapter 2, “The Request”, the request status of the Ajax object is equivalent to the HTTP status of the file that is being requested. HTTP status codes represent the response from the server based on the status of the file that is being requested. The codes are broken up into five categories, which cover all the possible responses that a server could return to an HTTP request. The HTTP status code categories are listed next; the xx after each number represents other digits ...