REST API

Overview

• REST: Representational State Transfer. Its a Architectural style for the web(makes use of HTTP).
• Key Abstraction: Resource. and Resource has URI(Uniform Resource Identifier). ex: /books/Joseph Murphy -> /books/{Author}. we can perform actions on resources like Retrive/Add/Update/Delete Books
• MappingJackson2HttpMessageConverter this jackson mapper will by default convert the bean into json.

REST API Methods

• GET: Retrieve details of a resource.
• POST: Create a new Resource.
• PU: Update an existing resource.
• PATCH: Update part of a resource.
• DELETE: Delete a resource.

Response Status for REST API

• Return the correct response status
• Resource is not found ==> 404
• Server exception ==> 500
• Validation error ==> 400

Important Response Statuses

• 200: Success
• 201: Created
• 204: No Content
• 401: Unauthorized(when authorization fails)
• 400: Bad Request(such as validation error)
• 404: Resource Not Found
• 500: Server Error