The documentation on HttpServletRequest is very poor, and this fills in a critical set of facts that you need to know to write a TomCat application.
The HttpServletRequest object will return the path to the current request with the following methods:
Imagine you have a tomcat server installed at http://server:8080/
Imagine you install an application in this server at “myapp”
That application has a servlet mounted at “servlet1”
The user then makes a request:
Here is the map of how the various functions decode this:
I won’t repeat what the documentation says — things like “use getContextPath to get the context path” without any explanation of what “context” we are talking about or how much of that context is included. A simple map like this helps show all the relationships.