Why does Ajax works fine in HTTP but not in HTTPS in FireFox?

[sekku]

When we are directly access the application from Application server(localhos t).I am getting the correct response.

This is URL
http://localhost:27110/vcm-ui/request?vui.req uest.transport= json&vui.respon se.transport=js on&vui.request =[{%22id%22%3A0.8 391487769614959 %2C%22action.ke y%22%3A%22messa ge%22%2C%22even t%22%3A%22multi ple%22%2C%22con tent%22%3A{%22c om.vignette.ui. framework.modul e.id%22%3A%22ta sk%22%2C%22com. vignette.ui.fra mework.module.v iew.mode%22%3A% 22table%22%2C%2 2baseName%22%3A %22com.vignette .ui.vcm.l10n.mo dule.TaskResour ce%22%2C%22keys %22%3A%22accept .action.label\t accept.action.d escription\trej ect.action.labe l\treject.actio n.description\t approve.action. label\tapprove. action.descript ion\tmenu.tour. label\tmenu.tou r.description\t menu.tour.url%2 2}}%2C]%20HTTP/1.1

Response
/*{xapi:{metadat a:{"user": "?","status ": "ok","reque st": "http://localhost:27110/vcm-ui/request"},conta iner:{"type": "vui","id": "0.839148776961 4959",data:[{"type": "vuiError","mes sage": "Current user is not authorized to perform the requested action.","id": "0.839148776961 4959","content" : "", "end": "---end-marker---"}]}}}*/

When we are trying to access from Webserver(https proxy) by redirecting to Application.I am getting encrypted response.

The URL for Access Webserver is

https://qa2.rpvgn.com/vcm-ui/request?vui.req uest.transport= json&vui.respon se.transport=js on&vui.request =[{%22id%22%3A0.8 391487769614959 %2C%22action.ke y%22%3A%22messa ge%22%2C%22even t%22%3A%22multi ple%22%2C%22con tent%22%3A{%22c om.vignette.ui. framework.modul e.id%22%3A%22ta sk%22%2C%22com. vignette.ui.fra mework.module.v iew.mode%22%3A% 22table%22%2C%2 2baseName%22%3A %22com.vignette .ui.vcm.l10n.mo dule.TaskResour ce%22%2C%22keys %22%3A%22accept .action.label\t accept.action.d escription\trej ect.action.labe l\treject.actio n.description\t approve.action. label\tapprove. action.descript ion\tmenu.tour. label\tmenu.tou r.description\t menu.tour.url%2 2}}%2C]%20HTTP/1.1

The Response I am getting is

������� �����������}��N �0D��J추6��+ �m�4Vd;]�# ʿcGp��mfwg���� �5�C��"SD�F�' Y���)�l � #?0OF�;M�ͫ�� |-�.8���ܹ:Y�Y�.x ���������^��W �C{85�˹=N�c+�� ����Q�r#ܶ�s" BϢ��, ��~a/8� �=�<��!�����%�;�����D ���u�U�F�l���N �)��R��I�e��� ��

Code Used for making a Ajax request is

		var xhr;
		if (window.XMLHttpRequest) {
			xhr = new XMLHttpRequest();
		}else if(window.ActiveXObject){
			xhr = new ActiveXObject("Microsoft.XMLHTTP");
		}
		// Open the socket
		// Passing null username, generates a login popup on Opera (#2865)
		alert("The URL is "+s.url);
		if( s.username )
			xhr.open(type, s.url, s.async, s.username, s.password);
		else
			xhr.open(type, s.url, s.async);

		// Need an extra try/catch for cross domain requests in Firefox 3
		try {
			// Set the correct header, if data is being sent
			if ( s.data )
				xhr.setRequestHeader("Content-Type", s.contentType);

			// Set the If-Modified-Since header, if ifModified mode.
			if ( s.ifModified )
				xhr.setRequestHeader("If-Modified-Since",
					vQuery.lastModified[s.url] || "Thu, 01 Jan 1970 00:00:00 GMT" );

			// Set header so the called script knows that it's an XMLHttpRequest
			xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
			xhr.setRequestHeader("Method", "GET "+s.url+" HTTP/1.1");

			// Set the Accepts header for the server, depending on the dataType
			xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
				s.accepts[ s.dataType ] + ",application/json, */*" :
				s.accepts._default );
		} catch(e){}

This working fine in IE 6 but not in FireFox and IE 7

Please help in solving it.

[acoder]

Perhaps you need to set the character encoding on the server-side. Check the page output without using Ajax, i.e. access the URL directly, and see the output.

[sekku]

gzip compression done by web server was not supported by IE7 and FF.
So we need to remove the compression from server level configuration, and it worked.

But by removing compression may affect the performance.
So I am looking for better solution,that browser understand gzip compression.