dart - Parameter type confusing -

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i trying use virtualdirectory class , find great example in web.

import 'dart:io'; import 'package:http_server/http_server.dart';  main() {     httpserver.bind('127.0.0.1', 8888).then((httpserver server) {         var vd = new virtualdirectory('./');         vd.jailroot = false;         vd.serve(server);     }); }

look @ call method serve 

vd.serve(server);

and passed parameter, httpserver type. when looking in api docs expected httprequest type.

streamsubscription<httprequest> serve(stream<httprequest> requests) serve stream of httprequests, in virtualdirectory.

why can pass httpserver instance serve method instead httpreqeust instance?

see documentation of httpserver

the httpserver stream provides httprequest objects.


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