REST API Interview Questions and Answers

Ques 1. Why is it simple to scale REST services?

Due to their statelessness, which prevents them from storing data from the server even since they are requested, REST services are scalable.

Ques 2. How big of a payload can you send using POST methods?

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.

Ques 3. What does the REST API's caching do?

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.

Ques 4. What distinguishes REST and SOAP from one another?

REST(Representational State Transfer): 

• It is a web service development architectural design pattern.
• It is more cacheable and speedier in speed.
• It just takes on the protocol-specific security measures that have been put in place.

SOAP (Simple Object Access Protocol): 

• It is a stringent protocol that is used to provide safe APIs.\
• It is not cacheable and moves more slowly.
• It can specify its own security precautions.

For more differences please check here: REST vs SOAP

Ques 5. What are a few REST's flaws?

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.

Ques 6. Mention a few of REST's most important attributes.

REST has a number of important features, including

• Because REST is stateless, the SERVER has had no state or session data
• The server might be resumed in between calls thanks to a well-implemented REST API because all data is sent to the server.
• While REST uses GET to access services, web services often employ POST to carry out tasks.

Ques 7. What do Web API Media type formatters do?

The Web API's Media type formatter includes:

• The foundation class used to handle serializing and deserializing solid objects is called MediaTypeFormatter.
• BufferedMediaTypeFormatter is an utility class that enables asynchronous formatters on top of the infrastructure for asynchronous formatters.

Ques 8. Please tell most commonly used HTTP status codes.

Ques 9. How does HTTP Basic Authentication work?