DELETE for Section 6.2?

[aaronpk]

6.2: “MUST inform the subscriber by sending an HTTP [RFC7231] GET request to the subscriber's callback URL”

Suddenly no HTTPS? :)

Why not DELETE? That would make the semantics clearer, does not make REST people cringe, and implementations can still easily detect notification POSTs.

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From #127 by @mkovatsc

[aaronpk]

Why not DELETE? That would make the semantics clearer, does not make REST people cringe, and implementations can still easily detect notification POSTs.

This has been discussed at length in #28 already, with the outcome being that this note was added to describe the spec's use of GET vs POST: https://www.w3.org/TR/websub/#verification-details

Suddenly no HTTPS? :)

As for HTTP vs HTTPS, this was not intended to restrict to HTTP URLs, so I've added an explicit mention of HTTPS in this case as well. This actually occurred in a few places so I made the changes there as well.