API(REST) ‐ gRPC ‐ GraphQL ‐ Web Services - prkirankumar/interview-preparation GitHub Wiki

  1. what is the core difference between HTTP PUT and HTTP POST, HTTP PUT and HTTP PATCH? (B)

[GET](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/GET) The GET method requests a representation of the specified resource. Requests using GET should only retrieve data.

[HEAD](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/HEAD) The HEAD method asks for a response identical to a GET request, but without the response body.

[POST](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST) The POST method submits an entity to the specified resource, often causing a change in state or side effects on the server.

[PUT](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/PUT) The PUT method replaces all current representations of the target resource with the request [content](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_Content).

[DELETE](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/DELETE) The DELETE method deletes the specified resource.

[CONNECT](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/CONNECT) The CONNECT method establishes a tunnel to the server identified by the target resource.

[OPTIONS](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS) The OPTIONS method describes the communication options for the target resource.

[TRACE](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/TRACE) The TRACE method performs a message loop-back test along the path to the target resource.

[PATCH](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/PATCH) The PATCH method applies partial modifications to a resource.

  1. Which method is not Idempotent ?

POST and PUT

  1. Explain about HTTP OPTIONS? (I/A)
  2. When will your Web API is treated as REST API?
    No, all Web APIs are not REST APIs. While both use the HTTP protocol for communication, a REST API uses specific URL structures, request types, and response codes to define its operations. REST stands for REpresentational State Transfer, an architectural style for defining network-based applications. follows Hypermedia as the Engine of Application State (HATEOAS).
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