freepascal.compiler/packages/fcl-web/examples/sse

Server-Sent events demo

The testsse demo shows how to use HTTP server-sent events. The testsse.lpr project can function as a client (receiver) or as a source (server) of events.

Server demo

To start the demo as a server, run

testsse -s

optionally, you can set a port with option -p:

testsse -s -p 3000

You can test the raw output with wget (or curl) like so:

wget --header="Accept: text/event-stream" "http://localhost:8080/events" -q -O -

The server understands the 'Last-Event-Id' header as specified in the spec, and will adapt the starting event accordingly:

wget --header="Accept: text/event-stream" --header="Last-Event-Id: 5" "http://localhost:8080/events" -q -O -

Client demo

To test the client, start the server (as described above) in one terminal window, and in another terminal window, start the client: To start the demo as a server, run

testsse -c

optionally, you can set the server port with option -p:

testsse -c -p 3000

optionally, you can set the last received ID with option -l:

testsse -c -l 5

The server will then start with event 6.

You can also try to capture the event stream of another server than the testsse server. Specify the u or url option:

testsse -c -u http://example.com/some-events-resource/