Error compiling to JavaScript. XMLHttpRequest error.

[swavkulinski]

What happened?

Console: Error compiling to JavaScript:
XMLHttpRequest error.

It was working fine through the morning. Suddenly it started to fail on every request. Is backend down?

Steps to reproduce problem

Start new Pad with Dart only
Press start button
Nothing happens
Try reload the page

error shows in the console:
Console: Error compiling to JavaScript:
XMLHttpRequest error.

Additional info

Browser

Browser: Chrome

Version: Version 81.0.4044.138 (Official Build) (64-bit) (MacOSX)

Are you using any extensions/plugins that affect website behavior
(particularly those that affect iframes, such as ad blockers)?

Are there any warnings or errors in your browser's JavaScript console?
If so, paste them below:

[paste warnings or errors here]

Machine

Operating system: MacOSX

Version: Catalina

Your code

What code was in the editor, if any, when the failure occurred? You
can paste it in below:

void main() {
  for (int i = 0; i < 5; i++) {
    print('hello ${i + 1}');
  }
}

DartPad's output

Did DartPad print anything to the console pane? If so, paste it below:

Error compiling to JavaScript:
XMLHttpRequest error.

If you were running Flutter code, you can also paste an image of the
Flutter output directly into this bug report.

[Dalamar]

Same issue here.

[swavkulinski]

same on other browsers

[joshuadeguzman]

Encountered the same, I actually just filed #1555. Though I experienced it inside embedding.

[camillo777]

Same here. I can add this error:

Error compiling to JavaScript:
TimeoutException after 0:01:00.000000: Future not completed

[prabakaran-Code]

Yes same Error found

[nagarjunvv]

Even I am facing same issue, it was working fine yesterday night.

[Eyitemi01]

same error over here

[kolmakovruslan]

Chrome console output
DevTools failed to load SourceMap: Could not load content for https://dartpad.dev/split.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE DevTools failed to load SourceMap: Could not load content for https://dartpad.dev/scripts/playground.dart.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE flutter:1 Access to XMLHttpRequest at 'https://dart-services.appspot.com/api/dartservices/v2/version' from origin 'https://dartpad.dev' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. playground.dart.js:9292 POST https://dart-services.appspot.com/api/dartservices/v2/version net::ERR_FAILED b4 @ playground.dart.js:9292 Cc @ playground.dart.js:1347 (anonymous) @ playground.dart.js:13182 (anonymous) @ playground.dart.js:1415 $2 @ playground.dart.js:6575 $1 @ playground.dart.js:6567 fl @ playground.dart.js:7371 $0 @ playground.dart.js:6933 eO @ playground.dart.js:1495 d0 @ playground.dart.js:6841 $0 @ playground.dart.js:6896 EF @ playground.dart.js:1525 EL @ playground.dart.js:1527 $1 @ playground.dart.js:6522 Fw @ playground.dart.js:532 (anonymous) @ playground.dart.js:540 childList (async) $1 @ playground.dart.js:6529 zP @ playground.dart.js:1532 e9 @ playground.dart.js:1593 ap @ playground.dart.js:6853 cD @ playground.dart.js:11673 hJ @ playground.dart.js:11206 eval @ VM790:3 $0 @ playground.dart.js:6733 $1 @ playground.dart.js:6741 cN @ playground.dart.js:7350 $1 @ playground.dart.js:7387 CH @ playground.dart.js:1451 CI @ playground.dart.js:1445 jj @ playground.dart.js:11204 (anonymous) @ playground.dart.js:11782 (anonymous) @ playground.dart.js:1415 $2 @ playground.dart.js:6575 by @ playground.dart.js:1401 d3 @ playground.dart.js:11784 jO @ playground.dart.js:11687 Dd @ playground.dart.js:4863 As @ playground.dart.js:5023 (anonymous) @ playground.dart.js:17220 (anonymous) @ playground.dart.js:17215 dartProgram @ playground.dart.js:17218 (anonymous) @ playground.dart.js:17220 flutter:1 Access to XMLHttpRequest at 'https://dart-services.appspot.com/api/dartservices/v2/analyze' from origin 'https://dartpad.dev' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. playground.dart.js:9292 POST https://dart-services.appspot.com/api/dartservices/v2/analyze net::ERR_FAILED

[swavkulinski]

Can't replicate anymore. Looks like the backend is working again.

[Eyitemi01]

same error over here

it works now

[RedBrogdon]

First off, thanks to @swavkulinski and the rest of you for reporting.

This morning, we experienced an outage in dart-services that we're still investigating. We've been able to bring the service back up, as you noticed, but the root cause has yet to be identified.

From here, we're going to:

• Determine exactly what caused dart-services to get into a non-working state, and
• Determine how we can get better monitoring/alerting in place. This could have been a thirty-minute problem rather than a six-hour problem, had the right people been notified at the right time.

I'm closing this issue, since calls to dart-services are once again working. While I'm bummed that so many people have been inconvenienced, the fact that so many of you noticed is a good signal that we're building something people like and care about. Thanks again for reporting the problem!

[allentv]

The CORS issue is still present. Here the screenshot from today

[nuggetsnetwork]

getting the same issue

[vineetg3]

Same issue being reproduced.
I tried enabling CORS, disabling adblock , tried on Chrome and Firefox(latest versions) and even used a vpn.

[allentv]

I am getting The server encountered a temporary error and could not complete your request. Please try again in 30 seconds. when I try a POST request through Postman.

[allentv]

So I downloaded the dart-services repo on my machine and ran the service locally. I made a POST request via Postman to the analyze endpoint and can confirm that the CORS headers are available in the response.

The issue seems to be a problem with the server which seems to be working now.

[domesticmouse]

Yeah it went sideways again. Restarted everything, this time with a rolling restart after four hours policy

[MohamedAlsadig]

I learned from someone in an Arabic forum that the cause of this problem is to prevent access from this geographical location, try to log in with a Vpn.

[gppam]

Just experienced this error. Went to dartpad after the dart.dev examples didn't work (which has the same error as dartpad).

[domesticmouse]

Please re-try. We recycle servers every 1.5 hours (give or take) in an effort to deal with these issues.

[Bukharee]

Error compiling to JavaScript:
XMLHttpRequest error. i dont know why im burnt out !!!

[HicksonWei]

Chrome DevTools Console Error:
Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('https://dartpad.dev') does not match the recipient window's origin ('null').

[patzu]

same error happening here as well. What is this?

[domesticmouse]

Please raise a new issue with steps to reproduce the error.

[rshash30]

You Should run a VPN and it will work correctly

[domesticmouse]

Actually, these errors were due to unhappy servers. We have done a lot of work to improve the stability of the compilation service. Using VPN service probably wouldn't have helped in this instance.

Thanks!

[tunjineo]

Error compiling to JavaScript:
LateInitializationError: Field 'version' has not been initialized.

This happens on the flutter website

[parlough]

Error compiling to JavaScript: LateInitializationError: Field 'version' has not been initialized.

This happens on the flutter website

Thanks for the report @tunjineo. I'm tracking the issue in #2494 and have a fix prepared at #2495.

[IshitaPathak]

In my case this error occurs due to some network issues 🥲