get packages failed behind corporate proxy

[AndreCahyaS]

Hello,
I'm sorry to open a new issue if this is actually a dup, but I've not found any solution to my issue for weeks reading all the possibly related issues already submitted, and I feel there's nothing exactly like mine.

I'm using flutter and I encountered a problem when I'm trying to get packages (flutter packages get),flutter upgrade, and anything that has something to do with fetching packages if I'm behind a corporate proxy that needs authentication.
I still can't fetch the packages even if I've set the environment variables as such :
http_proxy=http://user%40name:password@hostname:port
https_proxy=http://user%40name:password@hostname:port
(n.b. %40 since my username have '@' character)

FYI, I can access pub.dartlang.org just fine in the browser,
I could also access every link that was suggested in another related issues like mine.

This is my log from flutter run --verbose :

D:\__PROJECT\_FLUTTER\hobihobi>flutter run --verbose
[  +19 ms] executing: [C:\Development\flutter\] git rev-parse --abbrev-ref --symbolic @{u}
[  +38 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/stable
[        ] executing: [C:\Development\flutter\] git rev-parse --abbrev-ref HEAD
[  +21 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] stable
[        ] executing: [C:\Development\flutter\] git ls-remote --get-url origin
[  +20 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[        ] executing: [C:\Development\flutter\] git log -n 1 --pretty=format:%H
[  +21 ms] Exit code 0 from: git log -n 1 --pretty=format:%H
[        ] 8661d8aecd626f7f57ccbcb735553edc05a2e713
[        ] executing: [C:\Development\flutter\] git log -n 1 --pretty=format:%ar
[  +20 ms] Exit code 0 from: git log -n 1 --pretty=format:%ar
[        ] 6 weeks ago
[        ] executing: [C:\Development\flutter\] git describe --match v*.*.* --first-parent --long --tags
[  +21 ms] Exit code 0 from: git describe --match v*.*.* --first-parent --long --tags
[        ] v1.2.1-0-g8661d8aec
[  +75 ms] executing: C:\Development\android-sdk-windows\platform-tools\adb devices -l
[  +12 ms] Exit code 0 from: C:\Development\android-sdk-windows\platform-tools\adb devices -l
[        ] List of devices attached
           f612893c0904           device product:vince model:Redmi_5_Plus device:vince transport_id:1
[  +21 ms] Running "flutter packages get" in hobihobi...
[   +5 ms] Using C:\Development\flutter\.pub-cache for the pub cache.
[   +6 ms] executing: [D:\__PROJECT\_FLUTTER\hobihobi\] C:\Development\flutter\bin\cache\dart-sdk\bin\pub.bat --verbosity=warning --verbose get
--no-precompile
[ +248 ms] Proxy failed to establish tunnel (407 Proxy Authentication Required)
[   +9 ms] package:pub/src/source/hosted.dart 341:7          BoundHostedSource._throwFriendlyError
[   +2 ms] package:pub/src/source/hosted.dart 183:7          BoundHostedSource.describeUncached
[   +7 ms] ===== asynchronous gap ===========================
[   +1 ms] dart:async                                        _AsyncAwaitCompleter.completeError
[   +3 ms] package:pub/src/source/hosted.dart                BoundHostedSource.describeUncached
[        ] ===== asynchronous gap ===========================
[        ] dart:async                                        _asyncErrorWrapperHelper
[        ] package:pub/src/source/hosted.dart                BoundHostedSource.describeUncached
[   +1 ms] package:pub/src/source/cached.dart 39:18          CachedSource.doDescribe
[   +2 ms] ===== asynchronous gap ===========================
[   +5 ms] dart:async                                        _asyncThenWrapperHelper
[   +3 ms] package:pub/src/solver/version_solver.dart        VersionSolver._choosePackageVersion
[        ] package:pub/src/solver/version_solver.dart 97:22  VersionSolver.solve
[   +3 ms] ===== asynchronous gap ===========================
[   +1 ms] dart:async                                        _asyncThenWrapperHelper
[        ] package:pub/src/solver/version_solver.dart        VersionSolver.solve
[   +5 ms] package:pub/src/solver.dart 35:10                 resolveVersions.<fn>
[        ] package:pub/src/log.dart 378:18                   progress
[   +3 ms] package:pub/src/solver.dart 32:10                 resolveVersions
[        ] package:pub/src/entrypoint.dart 200:24            Entrypoint.acquireDependencies
[        ] This is an unexpected error. Please run
[        ]     pub --trace --verbosity=warning --verbose get --no-precompile
[        ] and include the logs in an issue on https://github.com/dart-lang/pub/issues/new
[   +9 ms] Running "flutter packages get" in hobihobi... (completed in 0.3s)
[   +2 ms] "flutter run" took 394ms.
[        ] "flutter run" took 394ms.
pub get failed (1)

#0      throwToolExit (package:flutter_tools/src/base/common.dart:24:3)
#1      pub (package:flutter_tools/src/dart/pub.dart:170:5)
<asynchronous suspension>
#2      pubGet (package:flutter_tools/src/dart/pub.dart:104:13)
<asynchronous suspension>
#3      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:533:13)
<asynchronous suspension>
#4      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:482:33)
<asynchronous suspension>
#5      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:142:29)
<asynchronous suspension>
#6      _rootRun (dart:async/zone.dart:1124:13)
#7      _CustomZone.run (dart:async/zone.dart:1021:19)
#8      _runZoned (dart:async/zone.dart:1516:10)
#9      runZoned (dart:async/zone.dart:1463:12)
#10     AppContext.run (package:flutter_tools/src/base/context.dart:141:18)
<asynchronous suspension>
#11     FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:473:20)
#12     CommandRunner.runCommand (package:args/command_runner.dart:196:27)
<asynchronous suspension>
#13     FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:396:21)
<asynchronous suspension>
#14     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:142:29)
<asynchronous suspension>
#15     _rootRun (dart:async/zone.dart:1124:13)
#16     _CustomZone.run (dart:async/zone.dart:1021:19)
#17     _runZoned (dart:async/zone.dart:1516:10)
#18     runZoned (dart:async/zone.dart:1463:12)
#19     AppContext.run (package:flutter_tools/src/base/context.dart:141:18)
<asynchronous suspension>
#20     FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:356:19)
<asynchronous suspension>
#21     CommandRunner.run.<anonymous closure> (package:args/command_runner.dart:111:29)
#22     new Future.sync (dart:async/future.dart:224:31)
#23     CommandRunner.run (package:args/command_runner.dart:111:11)
#24     FlutterCommandRunner.run (package:flutter_tools/src/runner/flutter_command_runner.dart:242:18)
#25     run.<anonymous closure> (package:flutter_tools/runner.dart:60:20)
<asynchronous suspension>
#26     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:142:29)
<asynchronous suspension>
#27     _rootRun (dart:async/zone.dart:1124:13)
#28     _CustomZone.run (dart:async/zone.dart:1021:19)
#29     _runZoned (dart:async/zone.dart:1516:10)
#30     runZoned (dart:async/zone.dart:1463:12)
#31     AppContext.run (package:flutter_tools/src/base/context.dart:141:18)
<asynchronous suspension>
#32     runInContext (package:flutter_tools/src/context_runner.dart:48:24)
<asynchronous suspension>
#33     run (package:flutter_tools/runner.dart:51:10)
#34     main (package:flutter_tools/executable.dart:52:9)
<asynchronous suspension>
#35     main (file:///E:/b/rr/tmpdrhwmy/w/archive/flutter/packages/flutter_tools/bin/flutter_tools.dart:8:3)
#36     _startIsolate.<anonymous closure> (dart:isolate/runtime/libisolate_patch.dart:298:32)
#37     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)`

My flutter doctor result is this :

Is the only way I could work on this is by using this solution below?
https://stackoverflow.com/questions/16808883/dart-pub-fail-behind-a-proxy-is-there-a-way-to-install-the-packages-manually
It's pretty bothersome if I need to remote my computer at home everytime I'm updating my dependencies, especially when I still have another dependency issues.

Thank you before, please tell me if you need more information on this.

[jonasfj]

Try to write a small a small program using dart:io and get that to work. If you can't get the following to work then there is a problem with how your HTTP proxy is configured, how you are supplying credentials, or how dart:io handles %40 in it's encoding, or how your proxy handles %40 in it's code (not unlikely)..

import 'dart:io';
import 'dart:convert';

Future<void> main() async {
  final client = HttpClient();
  final uri = Uri.parse('https://pub.dartlang.org/api/packages/test');
  final req = await client.getUrl(uri);
  final res = await req.close();
  final raw = await res.toList().then((l) => l.expand((i) => i).toList());
  final out = json.fuse(utf8).decode(raw) as Map<String, dynamic>;
  final ver = out['latest']['version'];
  print('Latest version of test package is $ver');
  client.close();
}

I'm not sure encoding with %40 will work (I have no idea).. you'll likely have to debug dart:io for this to work.

---

I'm not sure how much we can help you debug specific cases like this, as it could be so many things...
From the stack trace it looks as though your proxy might complain about missing authentication...

[alexanderconner]

Also experiencing this issue within a corporate proxy, same logged error and http proxy is set according to flutter doctor.

[Koushikphy]

having the same problem in Linux bash terminal

pub get failed (server unavailable) -- attempting retry 2 in 2 seconds...
Proxy failed to establish tunnel (407 Proxy Authentication Required)

I've used this #2111 (comment) and it throws this error

Unhandled exception:
HttpException: Proxy failed to establish tunnel (407 Proxy Authentication Required), uri = //pub.dartlang.org:443

Other things like apt, browser works fine with the proxy but flutter worn't. Note: my proxy credentials have one space and one @ that I replace with %20 and %40 .