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REST is a set of architectures that define how web services should be implemented. This architecture makes services easy to understand and use. REST is also known as the REpresentational State Transfer.
As we know, the Spring boot framework makes it easy to develop useful web services by providing auto configurations, annotations, starters, etc. As a Java developer right now, I have the chance to learn more about the main domains of different technologies in Prilient Technology.
They are as below:-
Autoconfiguration:- Spring Boot automatically configures many of the components that are used in creating web services.
Annotations:- Spring Boot uses annotations to request HTTP methods in code. Using it makes it easy to define an endpoint for calling any service.
Starters:- SB provides starters that are used to add and support different types of technologies that we can use in services. There is a starter for JSON (JavaScript Object Annotation) that gives a response in JSON data format.
Benefits of Restful web services in Spring Boot:-
Ease of development
Robustness
Methods of Web services:- The main methods for providing services are:
GET:- A resource is read by the GET method. We have to do mapping in our controller with the help of annotation @GetMapping(“/ABC”).
PUT:- It updates an already existing resource or set of data. We annotate @PutMapping for it.
POST:- With the help of it, we can create a new resource or new data, @PostMapping is used for it.
DELETE:- By using @DeleteMapping or DELETE method, we can remove the existing resource.
These are the four methods that are mostly used while creating RESTful(REpresentational State Transfer) services. There are many more methods, i.e,
PATCH, HEAD, OPTIONS.
It is used to describe how computers can communicate over the internet. HTTP is used for transferring hypertext documents like HTML pages between web servers and web browsers. It is a request and response protocol, which means that a client or user can send a request to the server and the server can respond to the client. The request includes the resource name, and the response includes the resource itself.
Status Code:- It is a three-digit code that is used to show the status of the HTTP request. The first digit of the status code defines the class of response. There are five classes of status codes, as below
Informational Response(1xx):- This indicates that the request has been received and proceeded with.
Successful Response (2xx):- This indicates that we have received a successful response to the request we sent.
200 OK:- getting a successful response
Redirection Message(3xx):- This means that the requested resource has been sent to a new location.
Client Error Response(4xx):- With this, we get that there is a problem with the request made by the client, which is why we get error messages.
a) 400 Bad Request:- This means that the request could not be understood by the server.
b) 401 Unauthorized:- The user client is not authorized to access the endpoint.
c) 403 Forbidden:- The client is not allowed to request the endpoint.
d) 404 Not found:- The requested resource or endpoint could not be found.
e) 405 Methods not allowed:- Means that the HTTP method we are using for the endpoint is
not right.
Server Error Response(5xx):- By doing so, we can configure that there is a problem in the server, the server is down, or the service is off.
a) 500 Internal Server Error:- When the server gets an unexpected error.
b) 503 Service Unavailable:- This means that the service is not available.
Resource-Based:- RESTful(REpresentational State Transfer) is based on resources. URIs (Uniform Resource Identifiers) allow access to resources, which are conceptual entities.
Uniform-Interface:- It uses a uniform interface.
Stateless:- It means that each endpoint or request is independent; it is not retable on the previous API response or API URL.
Cacheable:- The client can cache the response from the server. So we can say that web services are cacheable.
Web services: The phrase "web services" is used to describe any service that is available online. SOAP, REST(REpresentational State Transfer), and XML-RPC are just a few of the protocols that can be used to develop web services.
Web APIs: A specific kind of web service that uses the REST architectural style is a web API. Representational State Transfer, or REST, is an acronym. These limitations make RESTful web services simple to utilize.
The conclusion is that The RESTful web service and web API are used to interact between client and server. Because they are simple to use, RESTful web services are a popular choice for online services. Additionally, they are effective and scalable. Use HTTP techniques that are suitable for the action you are carrying out. The main thing is that platform and language independence are the primary features of REST APIs, which can be easily implemented using various programming languages.
