From: John Turner <[EMAIL PROTECTED]> Reply-To: "Tomcat Users List" <[EMAIL PROTECTED]> To: Tomcat Users List <[EMAIL PROTECTED]> Subject: Re: Port 80, 8009 and 8080 Date: Tue, 29 Jul 2003 12:51:58 -0400
We talked about this yesterday.
First, understand that port 8080 is OPTIONAL. It is not required.
If you integrate Tomcat with Apache, all that is required is a single connection on a single port.
That port can be ANY port you wish, it is up to you. By convention, the default for Apache connectors is 8009.
Tomcat has the ability to act as a web server WITHOUT Apache. A default installation is configured to do two things: be a webserver WITHOUT Apache, and integrate with Apache. Tomcat can do both at the same time.
By convention, web servers take requests on port 80. However, many people already have web servers running on machines where they install Tomcat. Thus, to avoid conflicts and make it easier to get started with Tomcat, the default HTTP port in a Tomcat installation is 8080, to avoid conflict with any existing web servers on port 80.
In production, if you run Apache + Tomcat, you DISABLE the HTTP connector on port 8080.
In production, if you do not run Apache and run Tomcat alone as your only webserver, you DISABLE the AJP connector on port 8009 and change the HTTP connector on port 8080 to port 80, so that web users do not have to type a port number on the URL.
In an Apache + Tomcat environment, the request comes in on port 80, Apache determines whether the request should be sent to Tomcat. If so, then the Apache connector module determines which port it can use to contact Tomcat (by default this is 8009). Tomcat is contacted on that port (Tomcat is already listening and waiting for connections on that port). Tomcat handles the request, and sends the result back to the Apache connector on the same port. Port 8080 is not involved in any way, shape or form.
This is why you can use two different URLs to diagnose problems:
Problem with http://localhost/examples = problem with connector Problem with http://localhost:8080/examples = problem with Tomcat
Both URLs can work, they are not mutually exclusive.
John
Hari Om wrote:
can any GURU's here give me a good step-by-step understanding as to how the request flows from Apache (port 80) to MOD_JK and AJP (Port 8009) and then to Tomcat (Port 8080). I am confused lately ....
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