"Not Modified" header followed by unexpected content with sitemesh3 and mod-jk

Question

In my Java / Struts2 / Tomcat application, when I request some resources that generate a "304 Not Modified" response, the file is still sent in response.

This is an example of an answer taken using Fiddler:

HTTP/1.1 304 Not Modified
Date: Thu, 26 Jun 2014 11:27:27 GMT
Server: Apache/2.2.16 (Ubuntu)
Connection: Keep-Alive
Keep-Alive: timeout=15, max=100
Vary: Accept-Encoding

/*! jQuery v1.7.2 jquery.com | jquery.org/license */
(function(a,b){function cy(a){return f.isWindow(a)?a:a.nodeType===9? 
a.defaultView||a.parentWindow:!1}function cu(a){if(!cj[a]){var b=c.body,d=f("
<"+a+">").appendTo(b),e=d.css("display");d.remove();if(e==="none"||e===""){ck||
[...]

This is a problem because the contents of the returned file are inserted into the next requested file, ending with corruption and strange behavior.

This only happens on resources loaded from the "/ struts" path, for example:

/struts/utils.js
/struts/js/base/jquery-1.10.2.min.js
/struts/js/base/jquery.ui.core.min.js?s2j=3.7.0

The path "/ struts" is processed by the struts2 class

org.apache.struts2.dispatcher.DefaultStaticContentLoader

These are the relevant elements of the system:

• Ubuntu 12.04.4 LTS (GNU / Linux 3.5.0-27-generic x86_64)
• JVM 1.6.0_31-b31 Sun Microsystems Inc. (also tried using ibm-java-x86_64-71)
• Apache2 2.2.22-1ubuntu1.6 with modjk
• Apache Tomcat / 6.0.35
• Struts 2.3.16
• Sitemesh 3.0.0

tomcat Not Modified.

Apache , /contents modjk:

JkMount /* ajp13_worker
JkUnMount /contents/* ajp13_worker

/struts - . ModJK - .

?

Answer 1

, , .

sitemesh3 apache. tomcat, 304. modjk/apache, .

, sitemesh: - struts "If-Modified-Since", . , 304 .

,

org.sitemesh.webapp.contentfilter.HttpServletRequestFilterable
org.apache.struts2.dispatcher.DefaultStaticContentLoader.process()

, . ? Apache Server Tomcat Struts Sitemesh?!

, tomcat apache, struts webapp sitemesh , URL-, fiddler2 :

http://[test.server.address]/struts/utils.js

o_O '

Edit:

modjk, , Apache:

: trying to connect socket 29 to 127.0.0.1:9009                                                     
: socket 29 [127.0.0.1:57195 -> 127.0.0.1:9009] connected                                           
: sending to ajp13 pos=4 len=581 max=8192                                      
.4.A....HTTP/1.1  
.../struts/utils  
.js...2.235.97.2  
[...]
...Accept-Langua  
ge..#en,en-US;q=  
0.8,it-IT;q=0.6,  
it;q=0.4....+JSE  
SSIONID=B77369AB  
D8239724A27A5CC5  
6E06DED8...If-Mo  
dified-Since...F  
ri,.27.Jun.2014.  
08:37:46.GMT....  
.0....AJP_REMOTE  
_PORT...19143...  
.JK_LB_ACTIVATIO  
N...............  
: (rdp_worker) request body to send 0 - request body to resend 0                              
: received from ajp13 pos=0 len=20 max=8192                                     
..0..Not.Modifie   
d...............   
: status = 304                                                                           
: Number of headers is = 0                                                               
: received from ajp13 pos=0 len=4767 max=8192                                   
.../*..*.$Id:.ut   
ils.js.1240312.2   
012-02-03.19:44:   
51Z.jogep.$..*..   
*.Licensed.to.th   
e.Apache.Softwar   
e.Foundation.(AS   
F).under.one..*.   
or.more.contribu   
tor.license.agre   
ements...See.the   
[...]   
the.ajaxValidati   
on.interceptor.S   
trutsUtils.getVa   
lidationErrors.=   
: ws_write::mod_jk.c (537): written 4763 out of 4763                                                                                    
: received from ajp13 pos=0 len=4 max=8192                                      
................   
: received from ajp13 pos=0 len=2 max=8192                                      
................   
: AJP13 protocol: Reuse is OK 

tomcat TCP- tcpflow, :

# tcpflow -p -s -c host xxx.xxx.xxx.xxx and port 8080

xxx.xxx.xxx.xxx.19292-yyy.yyy.yyy.yyy.08080: GET /rdp/struts/utils.js HTTP/1.1
Host: xxx.net:8080
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en,en-US;q=0.8,it-IT;q=0.6,it;q=0.4
Cookie: JSESSIONID=B0F02CXXXEC3448F1B927C0E8C579A9B
If-Modified-Since: Fri, 27 Jun 2014 08:49:23 GMT


yyy.yyy.yyy.yyy.08080-xxx.xxx.xxx.xxx.19292: HTTP/1.1 304 Not Modified
Server: Apache-Coyote/1.1
Date: Fri, 27 Jun 2014 08:52:43 GMT

, , ajp . , .

:

, , , Apache Server /struts:

• struts struts-jquery-plugin jars ( org\apache\struts2\static )
• apache , /struts
• unmap /struts modJK