How to serve a polymer application from dart shelf static file handler? - dart

Question

I'm trying to serve a polymer application using a shelf static server. I create next structure:
polymerapp
- pubspec.yml
- bin
- server.dart
- web
- index.html
- lib
- main_app.dart
- main_app.html
Inside server.dart I put this code:
import 'dart:io' show Platform;
import 'dart:async' show runZoned;
import 'package:path/path.dart' show join, dirname;
import 'package:shelf/shelf_io.dart' as io;
import 'package:shelf_static/shelf_static.dart';
void main() {
// Assumes the server lives in bin/ and that `pub build` ran
var pathToBuild = join(dirname(Platform.script.toFilePath()),
'..', 'web');
var handler = createStaticHandler(pathToBuild,
defaultDocument: 'index.html');
var portEnv = Platform.environment['PORT'];
var port = portEnv == null ? 9999 : int.parse(portEnv);
runZoned(() {
io.serve(handler, '0.0.0.0', port);
print("Serving $pathToBuild on port $port");
},
onError: (e, stackTrace) => print('Oh noes! $e $stackTrace'));
}
the rest is the template polymer application created by dart editor.
The problem is that when I try to access localhost:9999 from the browser it shows me the next errors:
Failed to load resource: the server responded with a status of 404 (Not Found)
http://localhost:9999/packages/paper_elements/roboto.html
Failed to load resource: the server responded with a status of 404 (Not Found)
http://localhost:9999/packages/polymertest/main_app.html
Failed to load resource: the server responded with a status of 404 (Not Found)
http://localhost:9999/packages/polymer/init.dart
An error occurred loading file: package:polymer/init.dart
I want to do this for a faster way of development. In that case I don't need to build the polymer-dart application every time that I made a change.

Answer 1

You can pass serveFilesOutsidePath: true to createStaticHandler()
var handler = createStaticHandler(pathToBuild,
defaultDocument: 'index.html',
serveFilesOutsidePath: true);
Also, during development you can use pub serve with shelf_proxy for incremental build. See here for an example.

Answer 2

The combination of shelf_proxy in dev shelf_static in prod is very useful. The clever dart team came up with the idea of combining those and I borrowed the idea in mojito. You can use it as follows
import 'package:mojito/mojito.dart';
final app = mojito.init();
app.router..addStaticAssetHandler('/ui');
The code for that is here which you can copy if you prefer