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

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

Option 1

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

ngrok http 9000 --host-header=rewrite

or

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

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: '0.0.0.0',    port: 8080,    disableHostCheck: true //for ngrok},