Tell us about secure HTTP methods.

Safe HTTP methods are methods that should not modify the server's state when executing the same request multiple times.

The safe HTTP methods include:

• GET: Used to retrieve data from the server. Should not have side effects on the server, except possibly logging or statistics.
• HEAD: Similar to GET, but the server returns only the response headers, without the body. Safe because it does not change the server's state.
• OPTIONS: Used to obtain information about the server or resource capabilities. Safe.
• TRACE: Allows the client to see the request path to the server. Safe.

It is important to understand that the safety of a method is its semantics, not a guarantee that the server implementation will not make changes. However, HTTP specifications assume this behavior.