Mercurial > prosody-modules
view mod_pubsub_eventsource/README.markdown @ 4203:c4002aae4ad3
mod_s2s_keepalive: Use timestamp as iq @id
RFC 6120 implies that the id attribute must be unique within a stream.
This should fix problems with remote servers that enforce uniqueness and
don't answer duplicated ids.
If it doesn't do that, then at least you can get a guesstimate at
round-trip time from the difference between the result iq stanza and the
timestamp it was logged without having to go look for when it was sent,
or needing to keep state.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Wed, 14 Oct 2020 18:02:10 +0200 |
parents | 4d73a1a6ba68 |
children |
line wrap: on
line source
--- labels: 'Stage-Beta' summary: Subscribe to pubsub nodes using the HTML5 EventSource API ... Introduction ------------ [Server-Sent Events](https://en.wikipedia.org/wiki/Server-sent_events) is a simple HTTP/line-based protocol supported in HTML5, making it easy to receive a stream of "events" in realtime using the Javascript [EventSource API](https://developer.mozilla.org/en-US/docs/Web/API/EventSource). EventSource is supported in [most modern browsers](http://caniuse.com/#feat=eventsource), and for the remainder there are 'polyfill' compatibility layers such as [EventSource.js](https://github.com/remy/polyfills/blob/master/EventSource.js) and [jquery.eventsource](https://github.com/rwldrn/jquery.eventsource). Details ------- Subscribing to a node from Javascript is easy: var source = new EventSource('http://pubsub.example.org:5280/eventsource/mynode'); source.onmessage = function (event) { console.log(event.data); // Do whatever you want with the data here }; ### Cross-domain issues The same cross-domain restrictions apply to EventSource that apply to BOSH, and support for CORS is not clearly standardized yet. You may want to proxy connections through your web server for this reason. See [BOSH: Cross-domain issues](https://prosody.im/doc/setting_up_bosh#proxying_requests) for more information. Configuration ------------- There is no special configuration for this module. Simply load it onto a pubsub component like so: Component "pubsub.example.org" "pubsub" modules_enabled = { "pubsub_eventsource" } As it uses HTTP to serve the event streams, you can use Prosody's standard [HTTP configuration options](https://prosody.im/doc/http) to control how/where the streams are served. **Note about URLs:** It is important to get the event streams from the correct hostname (that of the pubsub host). An example stream URL is `http://pubsub.example.org:5280/eventsource/mynode`. If you need to access the streams using another hostname (e.g. `example.org`) you can use the `http_host` option under the Component, e.g. `http_host = "example.org"`. For more information see the ['Virtual Hosts'](https://prosody.im/doc/http#virtual_hosts) section of our HTTP documentation. Compatibility ------------- ------- -------------- 0.9 Works 0.8 Doesn't work Trunk Works ------- --------------