reactjs - Invalid Host Header when ngrok tries to connect to React dev server

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Tags : reactjslocalhostngrokreactjs

Top 5 Answer for reactjs - Invalid Host Header when ngrok tries to connect to React dev server

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I'm encountering a similar issue and found two solutions that work as far as viewing the application directly in a browser

ngrok http 8080 -host-header="localhost:8080" ngrok http --host-header=rewrite 8080 

obviously replace 8080 with whatever port you're running on

this solution still raises an error when I use this in an embedded page, that pulls the bundle.js from the react app. I think since it rewrites the header to localhost, when this is embedded, it's looking to localhost, which the app is no longer running on

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Option 1

If you do not need to use Authentication you can add configs to ngrok commands

ngrok http 9000 --host-header=rewrite


ngrok http 9000 --host-header="localhost:9000"

But in this case Authentication will not work on your website because ngrok rewriting headers and session is not valid for your ngrok domain

Option 2

If you are using webpack you can add the following configuration

devServer: {     disableHostCheck: true } 

In that case Authentication header will be valid for your ngrok domain

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Don't know why but tried everything and it didn't work for me. What finally worked for me is this: ngrok http https://localhost:4200 -host-header="localhost:4200"

it might be useful for someone

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If you use webpack devServer the simplest way is to set disableHostCheck, check webpack doc like this

devServer: {     contentBase: path.join(__dirname, './dist'),     compress: true,     host: 'localhost',     // host: '',     port: 8080,     disableHostCheck: true //for ngrok }, 
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I used this set up in a react app that works. I created a config file named configstrp.js that contains the following:

module.exports = { ngrok: { // use the local frontend port to connect enabled: process.env.NODE_ENV !== 'production', port: process.env.PORT || 3000, subdomain: process.env.NGROK_SUBDOMAIN, authtoken: process.env.NGROK_AUTHTOKEN },   } 

Require the file in the server.

const configstrp      = require('./config/configstrp.js'); const ngrok = configstrp.ngrok.enabled ? require('ngrok') : null; 

and connect as such

if (ngrok) { console.log('If nGronk') ngrok.connect(     {     addr: configstrp.ngrok.port,     subdomain: configstrp.ngrok.subdomain,     authtoken: configstrp.ngrok.authtoken,     host_header:3000   },   (err, url) => {     if (err) {      } else {      }    }   );  } 

Do not pass a subdomain if you do not have a custom domain

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