Custom HTTP Server in Java

Figure 1: Diagram of HTTP Message Structure

This project is a custom implementation of an HTTP/1.1 server using Java, designed to handle basic HTTP methods like GET and HEAD, and parse HTTP messages as defined in the HTTP/1.1 specification (RFC 7230).

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📜 HTTP/1.1 Message Structure

HTTP-message = start-line *( header-field CRLF ) CRLF [ message-body ]

start-line = request-line / status-line

request-line = method SP request-target SP HTTP-version CRLF

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📌 Supported Methods

Method	Description	Sec.
GET	Transfer a current representation of the target resource.	4.3.1
HEAD	Same as GET, but only transfer the status line and header section.	4.3.2

• All general-purpose servers MUST support the methods GET and HEAD.
• All other methods are OPTIONAL.

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🚫 Error Handling

• 501 Not Implemented: If the server receives a method it does not recognize.
• 405 Method Not Allowed: If the server knows the method but it's not allowed for the target resource.

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📖 Reference

• RFC 7230 - Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing

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🧠 Notes

• The method token is case-sensitive.
• The allowed methods for a resource can be listed using the Allow header.
• HTTP was designed as an interface to distributed object systems, hence the method tokens.

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Feel free to contribute or suggest enhancements!