2.7 Procedure Invocation upon Request
The web-server/dispatchers/dispatch-pathprocedure
module defines a dispatcher constructor
for invoking a particular procedure when a request is given to a particular
URL path.
Checks if the request URL path as a string is equal to path
and if so, calls proc for a response.
This is used in the standard Web Server pipeline to provide a URL that refreshes the password file, servlet cache, etc.