Web-service Interview Questions

Interceptor and its use
How interceptor works
Controller Advice
How do we create interceptor
Rest
1. Richardson Rest Maturity model (4 level that defines the maturity of rest servies)
  - https://martinfowler.com/articles/richardsonMaturityModel.html
  - https://blog.restcase.com/4-maturity-levels-of-rest-api-design/
  - summarize above 2 bolgs
2. Rest Api
  1. in rest api a recommended term used to refer to multiple resources
  2. time to first hello world rest
  3. rest api to add the version in header by using accept and content type
    1. https://blog.allegro.tech/2015/01/Content-headers-or-how-to-version-api.html
3. Http Response Code
4. How communication is done between 2 rest services
5. What is Response Body
6. idempotent http req
7. restful services architecture
8. http methods
9. API security
  1. using oauth , what scope is required for write access to api
  2. which grant type support refresh token
  3. property to include in json to represent subresources /in rest api (llinks/embedded?)
benefit of GRAPHQL over rest approaches
WebHooks vs sync api and usage
how to handle transactional commit over distributed system (2phase commit , saga pattern – push or pull )
- when to use push vs when to use pull mechanism

HTTP Verb	CRUD	Entire Collection (e.g. /customers)	Specific Item (e.g. /customers/{id})
POST	Create	201 (Created), ‘Location’ header with link to /customers/{id} containing new ID.	404 (Not Found), 409 (Conflict) if resource already exists..
GET	Read	200 (OK), list of customers. Use pagination, sorting and filtering to navigate big lists.	200 (OK), single customer. 404 (Not Found), if ID not found or invalid.
PUT	Update/Replace	405 (Method Not Allowed), unless you want to update/replace every resource in the entire collection.	200 (OK) or 204 (No Content). 404 (Not Found), if ID not found or invalid.
PATCH	Update/Modify	405 (Method Not Allowed), unless you want to modify the collection itself.	200 (OK) or 204 (No Content). 404 (Not Found), if ID not found or invalid.
DELETE	Delete	405 (Method Not Allowed), unless you want to delete the whole collection—not often desirable.	200 (OK). 404 (Not Found), if ID not found or invalid.

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