React-native: Cannot connect to the server with the iOS simulator

[zendevil]

I have a server running at localhost:5000, and I'm using then http-proxy-middleware to connect my development client like so:

const proxy = require('http-proxy-middleware');
module.exports = function(app) {
    app.use(proxy('/auth/google', 
        { target: 'http://localhost:5000/' }
         ));
    app.use(proxy('/api/*', 
        { target: 'http://localhost:5000/' }
    ));
}

But the proxy isn't working. I get the following:

Error: Unable to resolve module `./debugger-ui/debuggerWorker.d9da4ed7` from ``: 

None of these files exist:
  * debugger-ui/debuggerWorker.d9da4ed7(.native|.native.expo.ts|.expo.ts|.native.expo.tsx|.expo.tsx|.native.expo.js|.expo.js|.native.expo.jsx|.expo.jsx|.native.ts|.ts|.native.tsx|.tsx|.native.js|.js|.native.jsx|.jsx|.native.json|.json|.native.wasm|.wasm)
  * debugger-ui/debuggerWorker.d9da4ed7/index(.native|.native.expo.ts|.expo.ts|.native.expo.tsx|.expo.tsx|.native.expo.js|.expo.js|.native.expo.jsx|.expo.jsx|.native.ts|.ts|.native.tsx|.tsx|.native.js|.js|.native.jsx|.jsx|.native.json|.json|.native.wasm|.wasm)
    at ModuleResolver.resolveDependency (/Users/prikshetsharma/Documents/vendo/client/native/node_modules/metro/src/node-haste/DependencyGraph/ModuleResolution.js:163:15)
    at ResolutionRequest.resolveDependency (/Users/prikshetsharma/Documents/vendo/client/native/node_modules/metro/src/node-haste/DependencyGraph/ResolutionRequest.js:52:18)
    at DependencyGraph.resolveDependency (/Users/prikshetsharma/Documents/vendo/client/native/node_modules/metro/src/node-haste/DependencyGraph.js:282:16)
    at /Users/prikshetsharma/Documents/vendo/client/native/node_modules/metro/src/lib/transformHelpers.js:267:42
    at /Users/prikshetsharma/Documents/vendo/client/native/node_modules/metro/src/Server.js:1305:37
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (/Users/prikshetsharma/Documents/vendo/client/native/node_modules/metro/src/Server.js:99:24)
    at _next (/Users/prikshetsharma/Documents/vendo/client/native/node_modules/metro/src/Server.js:119:9)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

[Unhandled promise rejection: Error: Network Error]
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:154704:26 in createError
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:154606:27 in handleError
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:32436:31 in dispatchEvent
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:31520:33 in setReadyState
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:31347:29 in __didCompleteResponse
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:7023:42 in emit
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:2774:49 in __callFunction
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:2487:31 in <unknown>
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:2728:15 in __guard
* http://127.0.0.1:19003/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:2486:21 in callFunctionReturnFlushedQueue
* [native code]:null in callFunctionReturnFlushedQueue
* http://localhost:19003/debugger-ui/debuggerWorker.d9da4ed7.js:4:907 in <unknown>

Why might this be?

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[ebaynaud]

Got stuck with this exact issue for hours. Just found that this occurs only on device where app is already installed with debug mode enabled.

I fixed it by:

• uninstalling manually app from device (cmd+H to display simulator home) then long click on app icon and click on cross to delete app => this forces disabling debug mode,
• then run app again from xcode.

Enabling debug mode after that works normally.

[garrettm]

I have this issue right now on Android, reinstalling the app doesn't seem to fix it. RN 0.61.5

[bobber205]

I have this issue right now on Android, reinstalling the app doesn't seem to fix it. RN 0.61.5

Having the same issue but on iOS.

[israNascimento]

Same here, any update? I didn't saw this before update to RN 0.61.5. In my case, the app shows a red box with "fetch is not a function", but on terminal the error is "Error: Unable to resolve module ./debugger-ui/debuggerWorker.d9da4ed7 from ``: "

[no-response[bot]]

It's been three weeks since we asked for additional information from the author of this issue. As it happens, we don't have enough information to take action. We are going to close this issue, but please do not hesitate to open a new issue if you are still encountering this problem.

[VitaliyGaliy]

same problem

[spzm]

I had the same issue and tried several ways to fix it: first, second. Unfortunately, it didn't help. But after rebooting my machine - debug starts working fine.

[trydalch]

I just had this issue. All I had to do was kill the app on the simulator. Double click the home button, click drag the app up to kill it.

Returned to the terminal where the bundler was still running, pressed i and it loaded just fine. Left the remote debugger going and it connected on its own.