This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
You should locate the documentation for the HTTP protocol, which if I remember correctly is called RFC2616. Here is the first thing that pops up in Google when searching for "RFC2616" - it defines exactly what the standard headers are and how they are used. The servlet container does all the work of parsing the request headers and creating the response headers for you. Bill