Extended Browser-Server Web Communications

1. XXX long polling
2. WebSockets
3. Server-Sent Events (SSE)
   • https://www.w3.org/TR/2012/WD-eventsource-20120426/
   • https://www.w3.org/TR/eventsource/
   • https://html.spec.whatwg.org/multipage/server-sent-events.html#the-eventsource-interface
   • `new EventSource( "some_url" )`
   • events: open, message, error, ( custom events )
   • `content-type` (mime) `text/event-stream` (utf-8)
   • newline delimited
   • lines: `event`, `data`, `:` (comment), `id`, `retry`
   • `${ field }: ${ value }`
   • sequential data lines are one string containing newlines
   • `MessageEvent`, type overriden by `data` fields
   • hyper-simple
   • events delimited by `event` lines or blank lines (`\n\n`)
4. WebTransport
   • experimental
   • https://w3c.github.io/webtransport/
   • https://www.w3.org/groups/wg/webtransport/
   • https://api.w3.org/groups/wg/webtransport/
   • https://api.w3.org/specifications/webtransport
   • https://developer.mozilla.org/en-US/docs/Web/API/WebTransport_API
   • https://developer.mozilla.org/en-US/docs/Web/API/WebTransport
   • https://github.com/w3c/webtransport
   • https://github.com/w3c/webtransport/blob/main/explainer.md
   • XXX https://www.w3.org/TR/raw-sockets/

     • ... Members of this Working Group have agreed not to progress the TCP UDP Sockets API specification further...

5. WebRTC
   • relies on prior mechanisms...

• 6 connection limit per domain
• use shared workers to share connections

w3.org api

- https://www.w3.org/api/
- https://api.w3.org/doc
	* https://api.w3.org/doc.json
	* https://api.w3.org/doc?_doc=1
	* https://api.w3.org/healthcheck
	* https://api.w3.org/specifications
		* https://api.w3.org/specifications/{shortname}
			* https://api.w3.org/specifications/HTMLComponents
			* https://api.w3.org/specifications/html40-mobile
			* https://api.w3.org/specifications/webtransport
	* https://api.w3.org/specification-series
	* https://api.w3.org/groups
	* `access-control-allow-origin: *`
		* https://api.w3.org/groups?items=500
		* https://api.w3.org/groups/wg/webtransport
- https, api.w3.org, json, read-only (`GET`)
- timestamps are (iso8601) `YYYY-MM-DDTHH:MM:SSZ`
- optional parameters, query parameter
	- embed (boolean) // add fields ???
		- HAL // https://stateless.co/hal_specification.html
			- JSON Hypertext Application Language // https://datatracker.ietf.org/doc/html/draft-kelly-json-hal
	- _doc (`1`) // get documentation for this endpoint
	- items (integer) // limit lists, default 100, max 1000
	- page (integer) // list page, default 1 ( 1-based indexing )