StatusText property describe result of client's
request (as set in StatusCode
property), sent as first line of response. It has no
meaning to the actual person connecting, but in case of
errors some clients may provide this text to the client to
help him understand what error occurred.
There are typical texts for different status codes. For
example, 404 is usually set to 'Not found',
but if you want you can change this value to 'I am
sorry but this resource does not exist' or
something similar.
Changing this property will cause StatusLine
property to be updated, and vice versa.