CloneContext returns a new context with a copy of the frame of the parent context, or a new frame if it does not have one.

ContextWithFrame adds a new empty frame to the context.

ContextWithFrameOf returns a new context derived from the parent, referencing the frame of x.

Of creates a new frame wrapping the headers of the HTTP request, response, response writer, header, or context.

Frame is a utility class that helps with manipulating the control headers.