The Gnutella specification is at GDF - LimeWire

Downloading is described at File Transfer - LimeWire

(but it might be outdated, see below)

which points to RFC 2616 (HTTP 1.1) http://www.ietf.org/rfc/rfc2616.txt

But since changing the escaping doesn't change the result, it doesn't look like that's the reason.

Maybe a look into the Phex source can help you:
https://phex.svn.sourceforge.net/svn...eDownload.java

...

damn, I see it: You don't request by sha1 URN.

IIRC, the URI in the get request should be like

Best wishes,
Arne

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