How do I verify that the Tomcat Gzip configuration works

When we use Tomcat to optimize the configuration, we always start Tomcat's Gzip compression. The configuration is as follows:

  <Connector port="9080" protocol="HTTP/1.1" 
        connectionTimeout="20000" 
        redirectPort="8443" URIEncoding="UTF-8" useBodyEncodingForURI="true"
        compression="on" 
        compressionMinSize="2048" 
        noCompressionUserAgents="gozilla, traviata" 
        compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain,image/gif,image/jpg" 
        
        />

Add the following to the connector tag in ES7en-ES8en-6 \conf\ server.xml

  <!-- Note : To use Gzip compression you could set the following properties : 
           compression="on" 
        compressionMinSize="2048" 
        noCompressionUserAgents="gozilla, traviata" 
        compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain,image/gif,image/jpg" 
   --> 

Parameter description:

compression="on" turns on compression
compressionMinSize="2048" enables compressed output content size when compressed object size > = this value is compressed, which defaults to 2KB
noCompressionUserAgents="gozilla, traviata" Compression is not enabled for the following browsers
compressableMimeType = "text/html, text/xml, text/javascript, text/css, text/plain, image/gif, image/jpg" compression type

Note: after tomcat7, the mimetype type of js file becomes application/JavaScript. The specific type defined by tomcat7 can be found in: conf/ web.xml file.

My Tomcat6 is still text/javascript

The mimetype type of Tomcat7 js file is changed to application/javascript
I will not compress if I mismatch

So how do we test that the configured Gzip compression works?
The answer is: use apache HttpClient to access a static resource (such as an js file) in the tomcat load project, and then print the requested resource content or resource ContentLength. If the printed resource content is a gibbe or ContentLength is -1, then gzip is valid.

import org.apache.commons.httpclient.HttpClient; 
import org.apache.commons.httpclient.methods.GetMethod; 
/**
 * @ClassName:     GzipTest.java
 * @Description:   TODO( with 1 What does the document do in a sentence ) 
 * 
 * @author         Administrator
 * @E-mail         809044093@qq.com 
 * @version        V1.0  
 * @Date           2014-3-27  In the morning 09:07:00 
 */
public class GzipTest { 


/** 
* @param args 
*/ 
public static void main(String[] args) throws Exception{ 
  HttpClient http = new HttpClient(); 
  GetMethod get = new GetMethod("http://127.0.0.1:9080/membercms/style/shop/js/base.js"); 
  try{ 
  get.addRequestHeader("accept-encoding", "gzip,deflate"); 
  get.addRequestHeader("user-agent", "Mozilla/5.0 (compatible; MSIE 6.0; Windows NT 5.0; Alexa Toolbar; Maxthon 2.0)"); 
  int er = http.executeMethod(get); 
  if(er==200){ 
   System.out.println(get.getResponseContentLength()); 
   String html = get.getResponseBodyAsString(); 
   System.out.println(html); 
   System.out.println(html.getBytes().length); 
  } 
}finally{ 
   get.releaseConnection(); 
   
} 
} 


} 

The console results are garbled

This method may cause some loss to server cpu.

Apache Enable Gzip compression configuration:

Remove the following two comments #

LoadModule deflate_module modules/mod_deflate.so
LoadModule headers_module modules/mod_headers.so

Join at httpd.conf

#apache Gzip
<Location /> 

# Insert filter 

SetOutputFilter DEFLATE 

# Netscape 4.x has some problems... 

BrowserMatch ^Mozilla/4 gzip-only-text/html 

# Netscape 4.06-4.08 have some more problems 

BrowserMatch ^Mozilla/4\.0[678] no-gzip 

# MSIE masquerades as Netscape, but it is fine 

BrowserMatch \bMSIE !no-gzip !gzip-only-text/html 

# Don't compress images 
SetEnvIfNoCase Request_URI .(?:gif|jpe?g|png)$ no-gzip dont-vary
SetEnvIfNoCase Request_URI .(?:exe|t?gz|zip|bz2|sit|rar)$ no-gzip dont-vary
SetEnvIfNoCase Request_URI .(?:pdf|doc|avi|mov|mp3|rm)$ no-gzip dont-vary

AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/js
# Make sure proxies don't deliver the wrong content 

#Header append Vary User-Agent env=!dont-vary 

</Location> 

Set after completion of access http: / / tool chinaz. com Gzips/enter your website domain name compression conditions.