HTTP Basics

• •Hypertext Transfer Protocol
• •Foundation of data communication on the web
• •Stateless request-response protocol
• •Client-server communication model

• •Request line (HTTP method, URL, HTTP version)
• •Headers (metadata about the request)
• •Empty line
• •Message body (optional)

• •GET: Retrieve data
• •POST: Create new resources
• •PUT: Update existing resources (complete replacement)
• •PATCH: Partial update of resources
• •DELETE: Remove resources
• •OPTIONS: Get supported methods for a resource
• •HEAD: GET without response body

• •1xx: Informational responses
• •2xx: Successful responses
• •200 OK, 201 Created, 204 No Content
• •3xx: Redirection messages
• •301 Moved Permanently, 304 Not Modified
• •4xx: Client error responses
• •400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found
• •5xx: Server error responses
• •500 Internal Server Error, 503 Service Unavailable

• •Content-Type: Media type of the resource
• •Authorization: Authentication credentials
• •User-Agent: Client application
• •Accept: Media types accepted by the client
• •Cache-Control: Caching directives

A diagram showing the HTTP request-response cycle between client and server,

with labeled components of requests and responses including methods, status

codes, and headers.

• •[MDN Web Docs: HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP)
• •[HTTP Made Really Easy](https://www.jmarshall.com/easy/http/)
• •[Understanding HTTP Basics](https://medium.com/swlh/understanding-http-basics-for-beginner-c2670dc906a3)
• •[RESTful API HTTP Methods](https://restfulapi.net/http-methods/)