Spring Boot REST HTTP Methods Explained (GET, POST, PUT, PATCH, DELETE)
HTTP methods define the action a client wants to perform on a resource. In Spring, we map them to controller methods using annotations like @GetMapping, @PostMapping, etc., or with @RequestMapping(method=...).
1. GET
Purpose: Retrieve a resource without modifying it
Safe & Idempotent: Yes
Spring Annotation: @GetMapping or @RequestMapping(method = RequestMethod.GET)
2. POST
Purpose: Create a new resource on the server
Not Idempotent: Multiple requests create multiple resources
Spring Annotation: @PostMapping
3. PUT
Purpose: Update or completely replace a resource
Idempotent: Repeating request has the same effect as once
Spring Annotation: @PutMapping
4. PATCH
Purpose: Partially update an existing resource
Idempotent: Yes, if handled carefully
Spring Annotation: @PatchMapping
5. DELETE
Purpose: Remove a resource from the server
Idempotent: Yes
Spring Annotation: @DeleteMapping
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