HTTP

The network protocol used on the Web to transfer HTML documents, images, JavaScript files, etc.

Cheatsheet

Status codes

• MDN: HTTP response status codes
• 200 OK
• 301 Moved Permanently
  • See Location header for redirect URL
• 302 Found
  • (temporary redirect)
• 400 Bad Request
• 401 Unauthorized
• 403 Forbidden
• 404 Not Found
• 405 Method Not Allowed
• 500 Internal Server Error

Request syntax

• MDN: HTTP messages

GET /example.txt HTTP/1.1
Host: example.com

Response syntax

• MDN: HTTP messages

HTTP/1.1 200 OK
Content-Type: text/plain
Content-Length: XXX

Hello, world!