RFC 2616 - Hypertext Transfer Protocol - HTTP/1.1 - HTTP/1.1 specification from the World Wide Web Consortium. RFC 2145 - Use and Interpretation of HTTP Version Numbers - This document tries to clarify the intentions of the specifications for HTTP versions 1.0 and 1.1. The aim is to avoid confusion regarding the use and interpretation of each. RFC 1945 - Hypertext Transfer Protocol - HTTP/1.0 - Despite the improvements made in version 1.1, HTTP/1.0 is still widely used around the Internet. W3C Hypertext Transfer Protocol Overview - This is the overview materials related to the W3C HTTP activity, one of the W3C Architecture domain activities. HTTP has been in use by the World Wide Web since 1990 and its use has increased steadily over the years, mainly because it has proven useful as a generic middleware protocol. Hypertext Transfer Protocol - Next Generation Overview - The purpose of the HTTP-NG Project is to tackle current HTTP deficiencies by using sound engineering practices. rproxy -- rsync in http - HTTP extensions to allow download of only the changes between cached and current versions of a page, PEP - W3C working draft of an Extension Mechanism for HTTP. Cookies - HTTP - Information on cookies including some background info, articles, technical specifications, and what consumer groups think. An Analysis of HTTP Performance - Paper by Joe Touch, John Heidemann, and Katia Obraczka of the USC/Information Sciences Institute. Tutorialspoint: HTTP Protocol - Tutorial for beginners. Methods, header fields, status codes are explained with examples. HTTP-Header Bulk Check - Checks up to 10 HTTP Headers from different URLs simultaneously. The 404 Checker - Webmaster tools to get information about websites, information on HTTP status codes. Suggestion on how to create a perfect 404 error page. HTTP Tools - Free tools for development, testing and debugging of HTTP client and server applications.