I have a CGI that is invoked by a web user to retrieve an
Acrobat PDF file, but I'm not happy with the results.

The URL looks something like

   http://.../getdoc.cgi?key=abc123

The CGI responds with

   Content-Type: application/pdf
   Content-Length: nnnn

   actual PDF contents begin here...

Netscape Navigator 4.0 (an awful version) passes the filename

   getdoc.pdf

to Acrobat on first invocation, then a "random" name like

   VUICI8A4.pdf

on subsequent invocations, but with a different name each time.

I can live with this behaviour, because at least it knows the
file is a PDF.

MS Internet Explorer 4.0, on the other hand, feigns no knowledge
of the file type, and asks me what app to pick for

   getdoc(1)

So the question is, is there a better way of telling the web
browser the name and/or type of the file?

With apologies for the off-topic nature of the post,

--Glenn