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2.1 Transport

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Messages are transported using HTTP, as specified in [RFC2518] and [RFC2616].

This protocol MAY be used with Secure Sockets Layer (SSL)/Transport Layer Security (TLS), as specified in [RFC2246], [RFC4346] and [RFC5246].

Port 80 is the standard port assignment for HTTP, and port 443 is the standard port assignment for HTTP over SSL/TLS. Implementations MAY support other ports.<2>