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After executing npm start, localhost:3000/ gives error 431. The ip address versions (192.168.1.3:3000, 127.0.0.1:3000) this loads up my app. No matter what react app I create, npm start, localhost:3000 opens my browser with a error 431. Wasn't sure if it was npm or node so i updated them both to the latest release. Still the same issue. I know I can simply CMD Click the http://192.168.1.3:3000 to open up my app, but the convenience of localhost:3000 loading helps the process. Help!

PHB
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  • 431 is Request Header Fields Too Large. Why you get this with the name but not the IP is odd. Therefore likely to be some configuration issue. Try adding some diagnostics (console output) to your node code to show it is processing a request. – Richard Mar 23 '20 at 07:06
  • In your browswers devtools there is a network tab, you can right click the request to localhost and choose copy => copy as fetch. Then add that to your question to see what the request looks like. You should also check out your [hosts file](https://en.wikipedia.org/wiki/Hosts_(file)) – HMR Mar 23 '20 at 08:12
  • @HMR I wasn't sure where i could right click. I checked my host file and followed [link](https://stackoverflow.com/questions/20345132/127-0-0-1-is-accessible-working-but-localhost-not-accessible-not-working) but still received ```error 431``` after ```npm start```. – PHB Mar 26 '20 at 08:02

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Your system might possibly have some configuration issues. LOCALHOST This link has some suggestions, Please do try those. Hope it goes on well!!.. Happy Coding!!

Anglesvar
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  • Thank you for the link, but after following it, I still receive the ```error 431```. I tried removing ```:::1 localhost``` and replacing it with ```127.0.0.1 localhost``` and vice versa, but but still ```npm start``` still loads up a ```error 431```. – PHB Mar 26 '20 at 07:59