The only thing i find somewhat weird at HUGE is that the sha1 is Base32 encoded. This means only 5 bits of a 8 bits byte are used. Just doesnt make sence... oh well

The GET request is somewhat strange as well... a simple:

GET urn:sha1:452626526(more of this ****)SDGERT GNUTELLA/0.4

would work just as well...

Some thoughts..