xmpp-httpx - v0.11.0
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    Variable NS_HTTPX_CONNECTConst

    NS_HTTPX_CONNECT: "urn:xmpp:http:connect:0"

    "This entity answers CONNECT with a tunnel" (n146 design ยง4.4). XEP-0332 v0.5.1 excludes CONNECT outright, so a requester must not send one to a peer that has not said so. Provisional, pending the XSF; if CONNECT moves to a companion <connect/> element, that element lives in this namespace.