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 Every API MUST support [HTTP/1.1](https://tools.ietf.org/html/rfc7230) and **MUST** adhere to its **semantic**.
 
 
+## HTTP Protocol Quick Start
+The understanding of HTTP starts with the understanding of [HTTP message](https://developer.mozilla.org/en-US/docs/Web/HTTP/Messages) and its routing.
 
+Once you are familiar with the **HTTP message structure** learn about the **HTTP request methods**, **HTTP response status codes** and **HTTP headers**. 
+
+Each HTTP request method, status code and header has its semantics defined and every API **MUST** strictly adhere to it.
+
+Follow the [Robustness Principle](core-principles/robustness.md). Use only the HTTP request methods, response codes and HTTP headers you understand, be liberal in accepting others.
+
+## Know HTTP
+The following documents are great overview of the HTTP protocol and related standards:
+
+- [HTTP Headers](https://github.com/for-GET/know-your-http-well/blob/master/headers.md)
+- [HTTP Request Methods](https://github.com/for-GET/know-your-http-well/blob/master/methods.md)
+- [HTTP Response Status Codes](https://github.com/for-GET/know-your-http-well/blob/master/status-codes.md)
+- [HTTP Link Relations](https://github.com/for-GET/know-your-http-well/blob/master/relations.md)
+
+
+Alternatively, you can download HTTP cheat sheets at [HTTP posters](https://github.com/bigcompany/know-your-http).
+
+## RFCs
+
+The HTTP protocol semantics is defined in the following RFCs:
+
+> 1. [RFC 7230, HTTP/1.1: Message Syntax and Routing](https://tools.ietf.org/html/rfc7230)
+> 1. [RFC 7231, HTTP/1.1: Semantics and Content](https://tools.ietf.org/html/rfc7231)
+> 1. [RFC 7232, HTTP/1.1: Conditional Requests](https://tools.ietf.org/html/rfc7232)
+> 1. [RFC 7233, HTTP/1.1: Range Requests](https://tools.ietf.org/html/rfc7233)
+> 1. [RFC 7234, HTTP/1.1: Caching](https://tools.ietf.org/html/rfc7234)
+> 1. [RFC 7235, HTTP/1.1: Authentication](https://tools.ietf.org/html/rfc7234)
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