ProxyPass and ProxyPassReverse use

hi,
I was going through this link

https://shibsp.ntu.ac.uk/confluence/display/SHIB2/Configure+Apache+mod_proxy_ajp;jsessionid=58A1EC7AA4B9E8E893FD1FE4BE350157

What is the meaning of below lines in apache

ProxyPass  /Hello ajp://localhost:8009/Hello
ProxyPassReverse  /Hello ajp://localhost:8009/Hello
RockingAsked:
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jeremycrussellCommented:
This configures the apache web server instance as a "Reverse Proxy" for the particluar context  "/Hello",

So, you could navigate to the apache webserver at the URL http://<apachewebserver>/Hello and the request would be forwarded to the Tomcat server at ajp://localhost:8009/Hello.

What you gain from this is that you "proxy" the requests through apache instead of sending them directly to the tomcat servers.  This allows you to utilize many other functions of the web servers that isn't provided by the tomcat server.
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RockingAuthor Commented:
Ok but it can be achieved by below
ProxyPass   /Hello ajp://localhost:8009/Hello

then what is the role of

ProxyPassReverse
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jeremycrussellCommented:
So, the "ProxyPass" directive does the actual mapping of the requests.   The "ProxyPassReverse" directive is there to tell apache to fix the responses from the server that's being proxied, to match that of the apache web server.   So, in this case, when the response comes back from localhost:8009, apache will fix it to show the client that the response is coming back from the apachewebserver:80.
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samriCommented:
rocking,

From Apache docs : http://httpd.apache.org/docs/2.2/mod/mod_proxy.html#proxypassreverse

More or less,  what jeremy explained.  Note however, the adjustment is only done at the response header, but the reference within the code/content is not changed.
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