Anatomy of Http

I ll post links related to the understanding the core HTTP here.

http://en.wikipedia.org/wiki/Http
http://www.jmarshall.com/easy/http/

For the introduction to Http this is a very good resource
http://www.httpwatch.com/httpgallery/introduction/

WebCaching Tutorial
http://www.mnot.net/cache_docs/

Tools and sites:
View HTTP Request and Response Header

wfetch.exe
http://support.microsoft.com/kb/284285

Tinyget.exe
http://support.microsoft.com/kb/840671

Fiddler
http://www.fiddlertool.com/fiddler/

HTTPWatch
http://www.httpwatch.com/

IEWatch
http://www.iewatch.com/

Ethereal
http://ethereal.com/