Storage for an event's headers.
Some specialized headers are automatically captured.
Content-Length header, parsed
Content-Length
Content-Type header
Content-Type
Control header
Control
Event-Name header
Event-Name
Reply-Text header
Reply-Text
Socket-Mode header
Socket-Mode
Return the value of the header, if present
Return true if the header is present
Record a single header and parse it
Storage for an event's headers.
Some specialized headers are automatically captured.