What HTTP methods do you know? How do PATCH and PUT differ? What happens if a PUT request is made to a resource that does not exist in the database? Is it possible to pass data via GET? How do POST and PUT differ? What is idempotency?

Main HTTP methods:

• GET — retrieve a resource
• POST — create a resource
• PUT — replace a resource
• PATCH — partially update a resource
• DELETE — delete a resource
• OPTIONS — find out supported methods

Differences between PATCH and PUT:

• PUT replaces the entire resource.
• PATCH modifies only specified fields, partial update.

If a PUT request is made to a resource with a non-existent ID:

• Usually, the server creates a new resource with that ID (if the API supports it), otherwise it returns an error.

Can data be transmitted via GET?

• Yes, through URL parameters (query string), but it is not recommended for sensitive or large data.

Differences between POST and PUT:

• POST creates a new resource, is not idempotent (repeating the request will create multiple resources).
• PUT is idempotent, replaces the resource at the specified URI.

Idempotency:

• A property of an operation where repeated execution yields the same result as a single execution. For example, PUT and DELETE are idempotent, POST is not.