REST is aka Representational State Transfer that help for stateless client-server communication.The server can be easily accessed over the network by Uniform Resource Identifier(URI).

The Restful Api is very common API development mechanism to access server data.The fullstack application has two layer one is front-end and second is backend. The back-end is an API that might be written in any programming language like PHP, Golang,Python etc.

The main benefit of Restful API is high scalability and maintainability, easy to create APIs, etc.

In this tutorial, you will find the collection of Rest Api question and answers, which help to rest api interview and improve your knowledge.

What Is RESTful API

When we create the rest API that implement REST architectural over the HTTP method, that type API called RESTful API.The main features of RESTful API is scalability and maintainability.You can create RESTFUL web service over HTTP methods like GET, POST, PUT and DELETE , that can be used to perform CRUD operations.You can create RESTful API on various programming languages etc.

How To Test Rest API

You can test RESTful API using Postman,Vrest etc.The HTTP get call also test using Web browser but post call need to test using API Tool.

How To send Authorization

We can pass any token into header of the rest API, The simple way to deal with authentication is to use HTTP basic authentication. We add ‘username:password’ encoded in base64 into Authorization key lie Authorization: Basic YgsrsvR==.

How To Create Custom Key Into Header

We can create custom key into Rest API Request header, and assigned to request object, that can be access from request header object onto the server.

What Are the Common Data Format of RESTful API

The data format is use to exchange data between client and server.The Request and Response data format would be type of JSON, YML, HTML or XML.Normally, JSON data format is use to send and receive data from the server.

What is the Cache in Rest API

This help to reduces the server load but in turn increase the scalability and performance of the server.Caching is the process in which server response is stored so that a cached copy can be used when required, There is no need of generating the same response again.

What is Cache-control header

There are following option available to cache API Data-

• Public : This help to cached data by any intermediate components between the client and server.
• Private : The Private header key help to cache data into the client side.
• no Cache : This means the REST API will cached any data nor client or server.

What are Different Type HTTP methods

• GET: This is a read only operation which use to fetch the information from the server.
• PUT: This operation is used for the updation of any existing information on the server.
• POST: This operation is used for creating an new information on the server.
• DELETE: This operation is used for deleting any resource on the server.
• OPTIONS: This operation uses the get the list of any supported options of resources that are available on the server.

What is the difference between PUT method and POST method?

PUT method is used to update any existing record and POST method is use to create a new record on the server.The PUT response always are same where is POST response is different on each request.

What is HTTP Status and Some Common HTTP status code

The HTTP Status code notifies the client, the request has been processed,accepted,success or failed, What was the reason for failed request.

• Code 200: This indicates success.
• Code 201: This indicates resource has been successfully created.
• Code 204: This indicates that there is no content in the response body.
• Code 404: This indicates that there is no method available.

You can get more information of HTTP Status Code.

What is Microservices

The microsystem is very popular architecture to create restfull apis.

• Microservices can adapt easily to other frameworks or technologies.
• Failure of a single process does not affect the entire system.
• Provides support to big enterprises as well as small teams.
• Microservices can be deployed independently and in relatively less time.

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