Stateless nature of HTTP

HTTP is stateless, which means every single request is independent from any other requests. By state it’s mean an application remembers some details about a client from one request to another.

HTTP verbs

The primary or most-commonly-used HTTP verbs (or methods) are POST, GET, PUT, PATCH, and DELETE. These correspond to create, read, update, and delete (CRUD) operations, respectively. There are a number of other verbs, but are utilized less frequently.

1. GET: The GET verb is a means of retrieving information from the Request-URI.
2. POST: The POST verb is intended as a way to create a new resource on the server.
3. PUT: The PUT verb is used as a method to update an existing resource on the server.
4. DELETE: remove a resource from the server.

1. Http Status Codes

Status codes are three digit codes paired with a phrase explaining whether or not the status completed successfully. By looking at the first digit a user can tell whether the response is providing information (100); was successful (200); has been redirected (300); there was an error in the request (400); or there was an error on the server (500).

2. Informational (100)

These indicate a provisional response. They are not supported by HTTP/1.0, because that version of the protocol did not define 1xx codes.

• 100 Continue
• 101 Switching Protocols

3. Success (200)

A 2xx code indicates the server successfully received, understood, and accepted the client request.

• 200 OK
• 201 Created
• 202 Accepted
• 203 Non-Authoritative Information
• 204 No Content
• 205 Reset Content
• 206 Partial Content

4. Redirection (300)

Servers use this class of code to indicate to a client further action needs to be taken to fulfill the original request.

• 300 Multiple Choices
• 301 Moved Permanently
• 302 Found
• 303 See Other
• 304 Not Modified
• 305 Use Proxy
• 307 Temporary Redirect

5. Client Error (400)

This set of status codes are meant to indicate the client made some sort of error in their request, such as being malformed or not allowed.

• 400 Bad Request
• 401 Unauthorized
• 402 Payment Required
• 403 Forbidden
• 404 Not Found
• 405 Method Not Allowed
• 406 Not Acceptable
• 407 Proxy Authentication Required
• 408 Request Time-out
• 409 Conflict
• 410 Gone
• 411 Length Required
• 412 Precondition Failed
• 413 Request Entity Too Large
• 414 Request-URI Too Large
• 415 Unsupported Media Type
• 416 Requested Range Not Satisfiable
• 417 Expectation Failed

6. Server Error (500)

A complement to 400 level errors, this status code indicates the server encountered some unexpected condition and could not fulfill the client’s request.

• 500 Internal Server Error
• 501 Not Implemented
• 502 Bad Gateway
• 503 Service Unavailable
• 504 Gateway Time-out
• 505 HTTP Version not supported

Reference :

1. Using HTTP Methods for RESTful Services
2. Frost, Matthew. Integrating Web Services with OAuth and PHP. Alexandria: musketeers.me, LLC. 2016.

The keystone of the Fascist doctrine is its conception of the State, of its essence, its functions, and its aims. For Fascism the State is absolute, individuals and groups relative. - Benito Mussolini