Various base http handlers
Base request handler with set of helpers.
Initialize request
Increment connection count
Decrement connection count
Tornado finish handler
Tornado on_connection_close handler
Enable client-side caching for the current request
Disable client-side cache for the current request
Handle JSESSIONID cookie logic
Finish session. If it will blow up - connection was set to Keep-Alive and client dropped connection, ignore any IOError or socket error.
CORS preflight handler
XHR cross-domain OPTIONS handler
Handles request authentication
Verify if request can be served