Hello Ralf,

> $ telnet proxy.charite.de 8080
> Trying 141.42.1.205...
> Connected to proxy.charite.de.
> Escape character is '^]'.
> GET http://cgi.clamav.net/sendfp.cgi HTTP/1.0

we use name based virtual hosting, you must switch to HTTP/1.1 and 
send a Host: header as well

See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html and
http://www8.org/w8-papers/5c-protocols/key/key.html

Most likely your proxy is issuing a HTTP/1.0 request upstream?

Best regards

-- 
Luca Gibelli (luca _at_ clamav.net)       ClamAV, a GPL anti-virus toolkit
[Tel] +39 0187 1851862 [Fax] +39 0187 1852252 [IM] nervous/jabber.linux.it
PGP key id 5EFC5582 @ any key-server || http://www.clamav.net/gpg/luca.gpg
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