1060:   onStateChange: function() {
1061:     var readyState = this.transport.readyState;
1062:     if (readyState > 1 && !((readyState == 4) && this._complete))
1063:       this.respondToReadyState(this.transport.readyState);
1064:   },
1065: 

1066:   setRequestHeaders: function() {
1067:     var headers = {
1068:       'X-Requested-With': 'XMLHttpRequest',
1069:       'X-Prototype-Version': Prototype.Version,
1070:       'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
1071:     };
1072: 
1073:     if (this.method == 'post') {
1074:       headers['Content-type'] = this.options.contentType +
1075:         (this.options.encoding ? '; charset=' + this.options.encoding : '');
1076: 
1077:       /* Force "Connection: close" for older Mozilla browsers to work
1078:        * around a bug where XMLHttpRequest sends an incorrect
1079:        * Content-length header. See Mozilla Bugzilla #246651.
1080:        */
1081:       if (this.transport.overrideMimeType &&
1082:           (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
1083:             headers['Connection'] = 'close';
1084:     }
1085: 
1086:     // user-defined headers
1087:     if (typeof this.options.requestHeaders == 'object') {
1088:       var extras = this.options.requestHeaders;
1089: 
1090:       if (typeof extras.push == 'function')
1091:         for (var i = 0, length = extras.length; i < length; i += 2)
1092:           headers[extras[i]] = extras[i+1];
1093:       else
1094:         $H(extras).each(function(pair) { headers[pair.key] = pair.value });
1095:     }
1096: 
1097:     for (var name in headers)
1098:       this.transport.setRequestHeader(name, headers[name]);
1099:   },
1100: 

1101:   success: function() {
1102:     return !this.transport.status
1103:         || (this.transport.status >= 200 && this.transport.status < 300);
1104:   },
1105: 

1106:   respondToReadyState: function(readyState) {
1107:     var state = Ajax.Request.Events[readyState];
1108:     var transport = this.transport, json = this.evalJSON();
1109: 
1110:     if (state == 'Complete') {
1111:       try {
1112:         this._complete = true;
1113:         (this.options['on' + this.transport.status]
1114:          || this.options['on' + (this.success() ? 'Success' : 'Failure')]
1115:          || Prototype.emptyFunction)(transport, json);
1116:       } catch (e) {
1117:         this.dispatchException(e);
1118:       }
1119: 
1120:       var contentType = this.getHeader('Content-type');
1121:       if (contentType && contentType.strip().
1122:         match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
1123:           this.evalResponse();
1124:     }
1125: 
1126:     try {
1127:       (this.options['on' + state] || Prototype.emptyFunction)(transport, json);
1128:       Ajax.Responders.dispatch('on' + state, this, transport, json);
1129:     } catch (e) {
1130:       this.dispatchException(e);
1131:     }
1132: 
1133:     if (state == 'Complete') {
1134:       // avoid memory leak in MSIE: clean up
1135:       this.transport.onreadystatechange = Prototype.emptyFunction;
1136:     }
1137:   },
1138: