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Introduction

 

What is Rest API?

            API is stand for Application Programming Interface is a set of subroutine definitions, protocols and tools for building application software.

REST: Is stands for Represtational State Transfer, It’s an architectural style that define a set of constrains and properties based on HTTP.

The fallowing HTTP method are typically used in a RESTFULL API.

GET: To retrieve resource representation/information only.

Example request URL.

1.HTTP GET http://www.appdomain.com/users

2.HTTP GET http://www.appdomain.com/user?size=2&page=3

POST: To create new subordinate resource, If a resource has been created on the server then the response should return code 201 ok (created).

PUT: To update existing resource, if resource does not exist then it will create new and return code 201 otherwise it will modify existing data return 200 ok.

DELETE: To delete resource, a successful resource of delete request should be HTTP response code 200 ok. If the response includes an entity descrying the status 202 (Accepted). If the action has been queued or 204(no content). If the action has been performed but the response does not include an entity.

PATCH: To make partial update on a resource. If you see PUT request also modify a resource entity so to make clear PATCH method is correct choice for partially updating an existing resource and PUT should only be used if you are replacing a resource in its entirely.

If you want to know about status code follow this link https://developer.mozilla.org/en-US/docs/Web/HTTP/Status .

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