Constants

CONTENT_ENCODING	=	"Content-Encoding"
CONTENT_SECURITY_POLICY	=	"Content-Security-Policy"
CONTENT_SECURITY_POLICY_REPORT_ONLY	=	"Content-Security-Policy-Report-Only"
FEATURE_POLICY	=	"Feature-Policy"
LOCATION	=	"Location"
SERVER_TIMING	=	"Server-Timing"
STRICT_TRANSPORT_SECURITY	=	"Strict-Transport-Security"
VARY	=	"Vary"
X_CASCADE	=	"X-Cascade"
X_REQUEST_ID	=	"X-Request-Id"