Re: I-D draft-petersson-forwarded-for-01.txt

>5.5.  Private extensions
>
>   Private extensions allow for adding own parameters and values.
>   Private parameters MUST be prepended with "x-".  This may be
>   particularly useful in a reverse proxy environment.

Can I suggest that for the same reasons that using x- for provisional
message headers is not recommended that you do not require x- as a parameter
prefix?

Also, it would be nice to have a "from" parameter, as alternative to the
>From Http header, that allowed the use of a URN to identify the requesting
user rather than being limited to an email address.

Regards,

Darrel Miller