What HTTP methods do you know? What is the difference between POST and PUT?

Main HTTP methods:

• GET — retrieve a resource
• POST — create a resource or perform an action
• PUT — replace a resource entirely
• PATCH — partially update a resource
• DELETE — delete a resource
• HEAD — get only the headers of a resource
• OPTIONS — find out supported methods

Differences between POST and PUT:

• POST is usually used to create new resources. POST requests are not idempotent — repeated requests can create multiple resources.
• PUT is used to replace or create a resource at a known URL. PUT is idempotent — repeated requests with the same data will not change the result.

Example:

• POST /users — creates a new user with a new ID
• PUT /users/123 — updates or creates a user with ID 123

Thus, POST is for creation with a server that assigns an identifier, PUT is for updating or creating at a specific address.