如何从jQuery Ajax而不是200获得304？

Question

My services returns a 304 but jQuery Ajax seems to convert it to a 200 OK result.

This is my request:

$.ajax({    
    url: '/api/items',    
    type: 'GET',    
    dataType: 'json',    
    contentType: 'application/json',    
    ifModified:true,    
    cache: false,    
    statusCode: {    
        304: function() {    
            alert("not modified"); // does not fire
        }    
    },    

    complete: function (xhr, status) {    
        console.log(xhr.status); // 200 
        }    
    }    
});

With Fiddler I can see that the service returns 304 correctly.

Why does jQuery convert it to a 200 ?

Answer 1

If You want to distinguish between them, use success(data, textStatus, jqXHR) event and read it from jqXHR.status

or access jqXHR other way:

var jqxhr = $.ajax(
    ...     
    statusCode: {    
        200: function() {    
            if(304 == jqxhr.status)
                alert("not modified"); // does not fire
        }    
    },    
)

Proper way to handle 304 not modified in jQuery ajax

edit

additional ajax() setting:

ifModified:true, // Lets respond `304:notmodified`

but it breaks data reponse:

http://forum.jquery.com/topic/how-to-fix-browser-cache-and-notmodified-respond-for-json-jquery-ajax-ifmodified-true-break-on-data-respond

but You've used it and it still works differently :-/