Transition Request: WebSub to Proposed Recommendation

This is a request from the Social Web Working Group to transition WebSub 
(formerly known as W3C PubSub and PubSubHubbub) to Proposed Recommendation.

Available with possible updates on the web at 
https://www.w3.org/wiki/Socialwg/WebSub_PR


      WebSub

  * CR: https://www.w3.org/TR/websub/
  * ED: https://w3c.github.io/websub/
  * Estimated publication date: 2017-10-03

Staged draft for publication:


      Abstract

WebSub provides a common mechanism for communication between publishers 
of any kind of Web content and their subscribers, based on HTTP web 
hooks. Subscription requests are relayed through hubs, which validate 
and verify the request. Hubs then distribute new and updated content to 
subscribers when it becomes available. WebSub was previously known as 
PubSubHubbub.

SOTD: Standard respec


      Decision to request transition

https://www.w3.org/wiki/Socialwg/2017-08-15-minutes#resolution06

And then Issue-119 <https://github.com/w3c/websub/issues/119> came up, 
which the WG decided to address with a normative change that it believes 
is not substantive, because it only affects handling of failure 
conditions. Resolution: http://www.w3.org/2017/09/05-social-irc#T17-22-24

And then #124 and #125 after informal director review. New resolution to 
publish with fixes for these: 
https://www.w3.org/wiki/Socialwg/2017-09-19-minutes#res-websubpr


      Changes since CR

https://w3c.github.io/websub/#change-log


      Requirements

Dependencies met: no change

Requirements satisfied: no change

Wide review: Through GitHub issues, all addressed: 
https://github.com/w3c/websub/issues?q=is%3Aissue+is%3Aclosed

Formal objections: None


      Implementations

Implementation reports at 
https://github.com/w3c/websub/tree/master/implementation-reports

Implementations-tests matrix: 
https://docs.google.com/spreadsheets/d/e/2PACX-1vSOBi6KBZ28xGqeUooxgNwTXder2lwMSeZU4umjRw2yA9SWYf4ZEVy25cFmNuXEgfFa7oiLO6WcQ6vC/pubhtml?gid=0&single=true 


All features of the spec have two or more independent implementations.