s = sine() # BEGIN # s = some source # Create a source equipped with a `insert_metadata` method: s = insert_metadata(s) # The handler def set_meta(request, response) = # Filter out unusual metadata meta = metadata.export(request.query) # Grab the returned message ret = if meta != [] then s.insert_metadata(meta) "OK!" else "No metadata to add!" end response.html("#{ret}") end # Register handler on port 700 harbor.http.register(port=7000, method="GET", "/setmeta", set_meta)