URL

Mosaic servers are located using URLs. Mosaic server URLs are subject to the following rules.

Scheme

Mosaic URLs MUST contain one of the following schemes which indicate which transport is used:

• mosaic for Mosaic over QUIC
• mosaictcp for Mosaic over TCP with TLS
• mosaicwss for Mosaic over WebSockets

Host

Mosaic URLs MUST contain a host.

This SHOULD normally be an IP address (either IPv4 or IPv6) but it MAY be a DNS name.

Hosts MAY be Tor onion sites (specified as a DNS name). When hosts are exposed through Tor, the scheme MUST NOT be mosaic since QUIC cannot transit Tor.

Port

Mosaic URLs MAY contain a port.

If a port is not provided, then the following defaults apply

• For mosaic (QUIC) the default port is 1320 (udp).
• For mosaictcp the default port is 1320 (tcp).
• For mosaicwss the default port is 443 (tcp).

Path

Mosaic URLs MUST specify the root path / exactly and no other path.

Other URL components

Mosaic URLs MUST NOT contain a user, password, query, or fragment section.

If any of these is found, software MUST ignore and SHOULD prune such information.