Re: Using ajp with tomcat

André Warnier <aw@xxxxxxxxxx> · Tue, 09 Dec 2008 10:29:45 +0100

Angelo Chen wrote:

Hi,

My purpose is:
http://192.168.1.1   goes to Apache HTTP server
www.myexample.com	 goes to my tomcat server

but this goes always to my tomcat server, any idea?

Thanks

Try inserting this *before* the other VirtualHost below :

 <VirtualHost *:80>
     ServerName localhost
     DocumentRoot .....
     ....
 </VirtualHost>

<VirtualHost *:80>
    ServerName www.myexample.com
    ProxyPass / ajp://localhost:8009/
    ProxyRequests Off
    ProxyPassReverse / ajp://localhost:8009/
    ProxyPreserveHost On
</VirtualHost>

Short explanation :
The *first* VirtualHost you define, is the *default* host.

It will "catch" all requests that do not specifically match a 

"ServerName" defined in any of the other VirtualHost sections.

As "ServerName" above, I put "localhost", but basically you can use 

anything that does not match the other "ServerName" directives in the 

other VirtualHos sections.

Longer explanation :
Under HTTP 1.1, requests to your server look like this :
GET /url HTTP/1.1
Host: somehost.somecompany.com

When Apache gets this, it tries to match the name given in the Host: 

header, to one of the "ServerName" directives of the <VirtualHost> 

sections.  It this match succeeds, Apache will serve this request using 

the "personality" (the configuration) of the matching VirtualHost.

If it does not succeed, then Apache will serve the request using the 

"personality" (the configuration) of the first-defined VirtualHost, no 

matter what that one says in its "ServerName" line.

That is why this first-defined VirtualHost is know as "the default host" 

: it will answer anything that Apache doesn't really know what to do 

with, so to speak.

Even longer explanation :

With your original configuration, the single <VirtualHost> section is, 

at the same time, the VH with ServerName "www.myexample.com", AND the 

default VirtualHost (because it is the first VH defined).

So, no matter which hostname is used in the request, as long as the 

request ultimately arrives to Apache, it will be served with the 

personality of that VirtualHost.

And, in your configuration of that VirtualHost, you redirect 

/everything/ to Tomcat. So what happens is quite normal.

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