Cannot connect to the server with the iOS simulator

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?

[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