Câu hỏi phỏng vấn API Design
Câu hỏi

Mention what is the difference between PUT and POST?

Câu trả lời

When designing APIs, understanding the differences between the HTTP methods PUT and POST is crucial. Here are the key distinctions:

Purpose and Usage

  • PUT: The PUT method is used to create or update a resource at a specific URI. If the resource already exists, PUT will update it; if it does not exist, PUT will create it. This method is idempotent, meaning that multiple identical requests will have the same effect as a single request[1][2][3][4].
  • POST: The POST method is used to create a new resource. It sends data to the server to be processed, which can result in the creation of a new resource. POST is not idempotent, meaning that multiple identical requests can result in multiple resources being created[1][2][3][4].

Idempotency

  • PUT: Idempotent. Repeating the same PUT request will not change the outcome beyond the initial application. For example, updating a user profile with the same data multiple times will result in the same profile[1][2][3][4].
  • POST: Not idempotent. Repeating the same POST request can create multiple resources. For example, submitting the same form multiple times can result in multiple entries in a database[1][2][3][4].

URI Specification

  • PUT: The client specifies the URI of the resource. The request body contains the complete representation of the resource to be created or updated[1][2][3][4].
  • POST: The server determines the URI of the new resource. The request body contains the data to be processed, which the server uses to create the resource[1][2][3][4].

Request Body

  • PUT: The request body must contain the entire resource representation. If only part of the resource needs to be updated, the entire resource must still be sent[1][2][3][4].
  • POST: The request body contains the data needed to create the resource. It can be partial data, and the server will handle the creation process[1][2][3][4].

Use Cases

  • PUT: Suitable for updating an existing resource or creating a resource at a known URI. Commonly used in RESTful APIs for update operations[1][2][3][4].
  • POST: Suitable for creating a new resource when the clien...
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