问题
I'm trying to play with https://github.com/dart-lang/web-ui-code-lab for dart development. If I follow the pdf and open step05, then try to run chat_server.dart, I get this error (my path has no spaces in it, in case that's relevant):
dart --enable-checked-mode bin/chat_server.dart
Unable to open file: path/to/web-ui-code-lab-master/step05/bin/packages/dart_chat/file_logger.dart'file:///path/to/dart/web-ui-code-lab-master/step05/bin/chat_server.dart': Error: line 5 pos 1: library handler failed
import 'package:dart_chat/file_logger.dart' as log;
^
I presume this means that there are some missing dependencies, but I can't run pub install because I'm behind a corporate http proxy:
Running pub install ...
Pub install failed, [1] Resolving dependencies...
Timed out trying to find package "web_ui 0.2.8+6" at http://pub.dartlang.org.
Hence, I started looking for a temporary workaround for pub dependency resolution. I tried changing the pubspec.yaml to go through the git:// protocol instead of http (which won't resolve without going through the proxy):
name: dart_chat
description: This is a chat app written in Dart using the Dart Web UI package
dependencies:
web_ui:
git: git://github.com/dart-lang/web-ui.git
I get further than before with pub install, so I think it successfully went through the git protocol and is trying to resolve web_ui's dependencies, but unfortunately doing so fails on web_ui's dependency for logging (which looks like it's still going through http://):
Running pub install ...
Pub install failed, [1] Resolving dependencies...
Timed out trying to find package "logging 0.2.7" at http://pub.dartlang.org.
It looks like I can't change the yaml to use the sdk's logging dependency either:
logging:
sdk: logging
because that's an incompatible source with web_ui:
Pub install failed, [1] Resolving dependencies...
Incompatible dependencies on 'logging':
- 'dart_chat' depends on it from source 'sdk'
- 'web_ui' depends on it from source 'hosted'
Is there any other way to get around this proxy issue with the current dev tools? Could I mirror pub.dartlang.org somehow? Or mirror the git repositories for each dependency? Thanks.
回答1:
You said that you're using a Mac. If it's a laptop, why don't you try doing it from home? I'll notify the author of pub about this issue to see if he has any suggestions.
回答2:
Currently there is no way to set a proxy in the Dart Editor, you can star this issue to check when it will be available.
I found a workaround to run the Pub install/update behind a proxy: in Windows, you can acess the "Environment variables" and add a variable named HTTP_PROXY with the value
https://USER:PASSWORD@my.proxy.adress:PORT
来源：https://stackoverflow.com/questions/13849336/is-there-a-workaround-for-pub-dependency-resolution-through-proxies