data{string|Buffer|Uint8Array}encoding{string}callback{Function}- Returns: {this}
This method signals to the server that all of the response headers and body
have been sent; that server should consider this message complete.
The method, response.end(), MUST be called on each response.
If data is specified, it is equivalent to calling
[response.write(data, encoding)][] followed by response.end(callback).
If callback is specified, it will be called when the response stream
is finished.
