class redirected_environment :This class overlays the input-side containers of an existing environment. The output-side containers (
?in_header:Nethttp.http_header -> ?properties:(string * string) list -> ?in_channel:Netchannels.in_obj_channel -> extended_environment ->
out_channel) are physically identical with the existing environment.
If one of the argument is not passed on class instantiation, the corresponding
overlay container is initialized with the current value of the passed
environment. As exception of this rule, the input channel is initialized with
an empty input channel.