lynx-dev Redirection in E-mail headers?

[pg]

Hello, Lyncei,

Is there a convention for formatting an E-Mail message so that
when it is opened it launches a viewer and displays a page not
contained in the message body?  Logically, this might be
as simple as a header:

    Location: http://host/path

and a dummy body.  But what of "Content-type:"?

Since for my purpose I can write both the sending and receiving
MUAs, I can make nearly anything work.  But of course I'd like to
follow any existing standard.

Thanks,
gil
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