Given a -Ffunction option,
DeleGate runs to do the specified function
which typically is a client-side action of a certain protocol.
You can omit entering lengthy "delegated -F" by
giving a file name "function" to an DeleGate executable file
and just call it as function.
The matching of function name is case-insensitive.
Command line options before -Ffunction and after "--" option
is regarded as options for DeleGate rather than for the function,
as delegated dgopt ... dgopt
-Ffuncfopt ... fopt
-- dgopt ... dgopt.
As an exception, parameter option, in name=value format,
is recognized as a parameter for DeleGate even if it appeared at
fopt position.
download a resource specified by URL,
and put to standard output with "-o" option.
With "-h" option, the header part of a HTTP response message will be put
together.