- // Set the correct header, if data is being sent
- if ( s.data )
- xml.setRequestHeader("Content-Type", s.contentType);
+ // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+ if ( s.ifModified ) {
+ if ( jQuery.lastModified[s.url] ) {
+ xhr.setRequestHeader("If-Modified-Since", jQuery.lastModified[s.url]);
+ }
+
+ if ( jQuery.etag[s.url] ) {
+ xhr.setRequestHeader("If-None-Match", jQuery.etag[s.url]);
+ }
+ }
+
+ // Set header so the called script knows that it's an XMLHttpRequest
+ xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+
+ // Set the Accepts header for the server, depending on the dataType
+ xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
+ s.accepts[ s.dataType ] + ", */*" :
+ s.accepts._default );
+ } catch(e){}