Planning on becoming a rest API professional? With the increasing demand for the role, the interviews have gotten tougher to crack, however, with the help of professionals we have curated important questions that will surely help you get the dream job role you always dreamt of.
A REST API, commonly referred to as a RESTful API, is a web API that complies with the restrictions of the REST architectural style and enables communication with RESTful web services. Computer scientist Roy Fielding came up with the acronym REST, which stands for neural style transfer.
An API must meet the following requirements in order to be deemed RESTful:
For easier understanding, we have divided these questions into two categories which are:
In RESTful web services, payloads are the request data sent via the POST or GET technique and located in the message's body of an HTTP request.
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There isn't, theoretically, a cap on the size of the payload that can be transmitted via POST methods. Larger payloads, however, may require more bandwidth. As a result, processing the request by the server can take longer.
REST APIs employ the HTTP protocol for client communication, whereas other protocols are used elsewhere.
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In order to quickly obtain a server answer in the future, REST API maintains a copy of the response in a specific region of computer memory. Catching is the term for this brief technique.
Sensitive information such as user id, password, or verification token should not be visible in URIs. REST APIs can be kept secure with the help of security initiatives including such authorization and authorization, API server affirmation, TLs/SSL encryption, rate-limiting for DDoS attacks, and more.
It is an HTTP protocol used to retrieve the HTTP operations or options that are supported and assist clients in selecting choices in REST APIs. CORS, or Cross-Origin Resource Sharing, employs the REST option approach.
REST(Representational State Transfer)
SOAP (Simple Object Access Protocol)
The architectural design used to create web APIs is
Logical URLs are used to identify resources; this is the fundamental component of a RESTful design. In contrast to SOAP web services, REST allows you to view the product information as a resource that should include all the necessary data.
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The many integration patterns include
In contrast to RPC-style web services, document-style web services allow us to send an XML document as part of a SOAP request. The application where a document-style web service is most suitable is one where an XML message behaves like a document, the content of which is subject to change, and the purpose of the web service is independent of the contents of XML messages.
Both JAX-WS and JAX-RS are frameworks (APIs) that allow for different types of communication in Java. A library called JAX-WS can then be used to do SOAP communications in Java, whereas JAX-RS enables REST communication.
There are various web service testing tools for REST APIs.
Unified resource identifier is referred to as a URI. A URI in REST is a string which designates a web server's resource. Each resource has a distinct URI that, when used in a Http response, enables clients to target it and do actions on it. Addressing is the process of directing traffic to a resource using its URI.
In GET or POST requests, the term "payload" refers to data in the content of the HTTP response and/or response messages. For instance, if you ask the Twitter API for a specific tweet, the payload will include the document detailing the tweet's content as well as any necessary files for putting the tweet on a website. The HTTP request's payload could also be included using the POST method. The tweet text that you supply in the POST request is the payload when you want to post a tweet using Twitter's API.
Statelessness is an advantage of REST, but it can also be a drawback. State is not preserved through REST. In those other words, the server doesn't save a history of previous communications. If maintaining state is required, the client is responsible for doing so. Developers must exercise caution and only use APIs from reliable, authentic providers as REST has less stringent security controls than SOAP. REST is therefore a bad choice for transmitting private data among servers and clients.
RESTful APIs can be tested using a variety of software tools, including JMeter, Katalon and PostmanStudio. Sending numerous calls from the testing tool and watching how your API reacts are often steps in the testing process. You can quickly run numerous different scenarios thanks to the capability for automated testing provided by various testing solutions.
REST has a number of important features, including
The core idea behind Restful architecture is resource. A resource is a thing that:
Resources are labeled as:
The following are crucial considerations while creating a resource's representation format for a RESTful web service. −
A RESTful web service should not maintain a client state on the server in accordance with REST design. Statelessness is the term for this limitation. The client must transmit its context to the server, which can then store it and use it to perform the client's subsequent requests. For instance, the session identifier given by the client can be used to identify a server-maintained session.
Because GraphQL hides your microservice architecture from the customers, it works perfectly with microservices. From the front end, you want all the data to come from a small API, while from the back end, you want to divide it into microservices. The best technique I'm aware of to do both is by using GraphQL. It enables you to divide the backend into microservices while still giving each application a single API and enabling joins across data from various services.
Uniform Resource Identifier is what URI stands for. In a REST architecture, a URI identifies each resource. Locating a resource or resources on the server hosting the web service is the purpose of a URI.
The Web API's Media type formatter includes:
Representational State Transfer is referred to as REST.
An API, or application programming interface, is a software-to-software interface that permits communication and data sharing between otherwise independent applications. All data is regarded as resources in a REST API, and each resource is identified by a distinct standard resource identifier (URI).
RESTful web services, which adhere to the REST architecture, are another name for REST API.
To manage catching and achieve caching, cache-control headers are employed. Public, private, and No-Store are the three cache-control headers that are most frequently used.
The following distinguishing characteristics of REStful online services:
When a REST client wishes to send a request to the server using a REST API web service, they can do so using an HTTP application form, and the server is no different. In REST, this type of communication is known as messaging.
Addressing is the term used to describe how RESTful web services locate different sorts of resources using a URL on the REST server. Resources typically address a single or a number of resources.
Due to their statelessness, which prevents them from storing data from the server even since they are requested, REST services are scalable.
Duplicate calls on the client side are known to result in problems since idempotent techniques are known to provide the same result even after the identical request has been submitted many times.
Tools like Swagger and Postman, which allow users to examine query parameters, headers, and response headers, as well as document endpoints and convert them to XML and JSON, can be used to test RESTful web services.
You can now approach the interviews with confidence because you have a good understanding of how to respond to some of the typical REST API interview questions.
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .
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