code: def get_streams(environment, start_response, headers):
    
    start_response('200 OK', headers)
    streams_seen_so_far = set()
    namespace = environment['json'].get('namespace', settings.default_namespace)
    for prefix, backend in router.get_read_backends(namespace):
      for stream in backend.streams(namespace):
        if stream.startswith(prefix) and stream not in streams_seen_so_far:
          streams_seen_so_far.add(stream)
          yield '{0}\r\n'.format(stream)
    yield ''
docs: List all streams that can be read from Kronos right now.
    POST body should contain a JSON encoded version of:
      { namespace: namespace_name (optional)
      }