REST API 面试题与答案

问题 41. What do you know about HTTP status codes?

These are the standard codes that refer to the predefined status of the task at the server. Following are the status codes formats available:

• 1xx - represents informational responses
• 2xx - represents successful responses
• 3xx - represents redirects
• 4xx - represents client errors
• 5xx - represents server errors

问题 42. Please tell most commonly used HTTP status codes.

问题 43. What are the HTTP Methods?

HTTP Methods are also known as HTTP Verbs. They form a major portion of uniform interface restriction followed by the REST that specifies what action has to be followed to get the requested resource. Below are some examples of HTTP Methods:

• GET: This is used for fetching details from the server and is basically a read-only operation.
• POST: This method is used for the creation of new resources on the server.
• PUT: This method is used to update the old/existing resource on the server or to replace the resource.
• DELETE: This method is used to delete the resource on the server.
• PATCH: This is used for modifying the resource on the server.
• OPTIONS: This fetches the list of supported options of resources present on the server.

The POST, GET, PUT, DELETE corresponds to the create, read, update, delete operations which are most commonly called CRUD Operations.

问题 44. What are the HTTP methods and idempotent and which are non-idempotent?

问题 45. Can you tell what constitutes the core components of HTTP Request?

In REST, any HTTP Request has 5 main components, they are:

• Method/Verb − This part tells what methods the request operation represents. Methods like GET, PUT, POST, DELETE, etc are some examples.
• URI − This part is used for uniquely identifying the resources on the server.
• HTTP Version − This part indicates what version of HTTP protocol you are using. An example can be HTTP v1.1.
• Request Header − This part has the details of the request metadata such as client type, the content format supported, message format, cache settings, etc.
• Request Body − This part represents the actual message content to be sent to the server.