Tomcat启用GZIP，tomcat6和7的不同之处

不知道是什么原因，tomcat7将javascript的contentType变成了application/javascript,而在tomcat6以及之前的版本，从来都是text/javasctript.
下面是两个版本tomcat启用GZIP的配置信息：
tomcat6的配置：

 <Connector URIEncoding="UTF-8" connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"
    		   compression="on"   
               compressionMinSize="50" noCompressionUserAgents="gozilla, traviata"   
               compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain"/>

tomcat7的配置：

 <Connector URIEncoding="UTF-8" connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"
    		   compression="on"   
               compressionMinSize="50" noCompressionUserAgents="gozilla, traviata"   
               compressableMimeType="text/html,text/xml,application/javascript,text/css,text/plain"/>