[Spring] Spring Boot REST HTTP

REST over HTTP

REST CRUD APIs(2)

• Most common use of REST is over HTTP
• Leverage HTTP methods for CRUD operations

HTTP Method	CRUD Operation
POST	Create a new entity
GET	Read a list of entities or single entity
PUT	Update an existing entity
DELETE	Delete an existing entity

HTTP Request Message

• Request line: the HTTP command
• Header variables: request metadata
• Message body: contents of message

HTTP Response Message

• Response line: server protocol and status code
• Header variables: response metadata
• Message body: contents of message

HTTP Response - Status Codes

| Code Range | Description | | ———- | ————- | | 100-199 | Informational | | 200-299 | Successful | | 300-399 | Redirection | | 400-499 | Client error | | 500-599 | Server error |

• 401 Authentication Required
• 404 File Not Found
• 500 Internal Server Error

MIME Content Types

• The message format is described by MIME content type
  • Multipurpose Internet Mail-Extention
• Basic Syntax: type/sub-type
• Examples
  • text/html, text/plain
  • application/json, application/xml, …

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