What are unsafe methods?

Unsafe methods (or methods that modify server state) are HTTP methods that can change data on the server. When such a request is repeated with the same parameters, the result may be different or have side effects. These include:

• POST: Used to send data to create or update a resource.
• PUT: Used for completely updating a resource at the specified URL.
• DELETE: Used to delete a resource at the specified URL.
• PATCH: Used for partial updates of a resource.