A very simple request:
A person connects to the server using a telnet on the port 80, then asks for the first page.
The response is chunked (header contains Transfer-Encoding: chunked) - a first group of 8e4f chars is sent, then the server sends the length of the next group, hier 0 = the end of the document Request/ Response
Request for the index.html resource on the same server (that does not exist). The Response contains the status 404 Not Found Request/ Response
Get for a resource index.php with a parameter id=123
The response has a content-length Request/ Response
We connect to a machine having multiple hosts (host for telnet has not the same name as host) and want to access a resource.
The response contains a redirect to a secure URL (https). Request/ Response
Listen and Intercept HTTP trafic
Use Web Scarab (the simple, not the NG), to read and manipulate HTTP trafic. You will be able to intercept and spoof any HTTP parameter: Web Scarab