- WSGI: Webserver gateway interface
- a protocol that makes it easy to swap python web application frameworks
- Client downloads html document
- container page
- typically in ascii
- contains instructions for site rendering
- links to other pages
- can contain embedded objects
- automatically retrieved
- carriage return and line feed indicate end of headers
- headers may contain private information
- os used
- browser used
- cookie information
- get: retrieve a file (95% of requests)
- head: just get meta-data
- post: submitting a form to a server
- put: store enclosed document as uri
- delete: removed named resource
- trace: http echo for debugging
- connect: used for proxies for tunneling
- options: request for server or proxy options
- 1XX: Informational
- 100 Continue, 101 Switching protocols
- 2XX: Success
- 200 OK, 206 Partial Content
- 3XX: Redirection
- 301 Moved Permanently, 304 Not Modified
- 4XX: Client Error
- 400 Bad Request, 403 Forbidden, 404 Not Found
- 5XX: Server Error
- 500 Internal Server Error, 503 Service Unavailable, 505 HTTP Version Not supported