gecko-dev/testing/web-platform/tests/tools/pywebsocket/example/eventsource.cgi

#!/usr/bin/python

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"""This CGI script generates text/event-stream type data stream for testing
the Server-Sent Events.

It will only work correctly with HTTP servers that do not buffer the output of
CGI scripts.
"""


import sys
import time

sys.stdout.write('Content-type: text/event-stream\r\n\r\n')

id = 0

while True:
  sys.stdout.write('data: Hello\r\nid: %d\r\n\r\n' % id)
  sys.stdout.flush()

  id = id + 1

  time.sleep(1)