Hypertext Transfer Protocol, or HTTP is a communication protocol used to convey or transfer information on Internet and Intranet. Its original purpose was to provide a way to publish and retrieve hypertext pages.

1. 200 OK: Represents a successful response from the web server. This occurs when a page is successfully delivered to the browser.
2. 403 Forbidden: Indicates the browser was not able to successfully communicate with the server. In many cases this is caused by a failed authentication.
3. 404 Not Found: Indicates there was a successful connection with the server, however the file requested could not be found. This occurs when a file is missing, or there is a misconfiguration on the server.

Hypertext Transfer Protocol uses 8 different request methods in total. These methods indicate the type of action that is performed.

1. HEAD: Used to retrieve meta related information.
2. GET: Requests the use of a specific resource.
3. POST: Submits data to a specific resource. Commonly used with web forms to process and transmit data.

• Google Books : HTTP:The Definative Guide

• Google Books : HTTP Pocket Reference

• Amazon.com: HTTP: The Definitive Guide

• O'Reilly: HTTP pocket reference

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