"Invalid Host header" when running Angular/cli development server c9.io

Current command: ng serve --host --public $IP:$PORT

Results on my website:

Invalid Host header


The --disable-host-check flag works fine if you need to run from Cloud9.

I use the following command:

ng serve --open --host $IP --port $PORT --disable-host-check

You need to specify the host

ng serve --port 8080 --host

See this issue

Edit the following line in node_modules/webpack-dev-server/lib/Server.js (line 425), change to:

return true;

I am using cloud9 IDE then run: ng serve --port 8080 --host Now works fine.

Using the command below works for me.

ng serve --host --port 8080  --public ipAddress

You need to run following : ng serve --port 8080 --publicHost ( your server ip or host name). works for me .

I was facing same error after deploying my angular app on AWS EC2 instance having bitnami image. Then i launched my app with below command and it worked fine.

ng serve --host --port 8080 --disableHostCheck true

Use the command below works for me for Angular CLI: 6.0.7

ng serve --host --port 8080 --disableHostCheck

Tested on the below version of Angular and server Amazon.

Angular CLI: 6.0.8
Node: 8.11.3
OS: linux x64
Angular: 5.2.8

ng command options has been changed, now use configuration instead of env. The command which worked for me is

 ng serve --configuration=dev  --port 4009 --host --publicHost myhost.com

Never use --disable-host-check on a public server. Angular will warn you if you use this. It may work but it is a serious security issue. You will get this message if you use that flag.

WARNING: Running a server with --disable-host-check is a security risk. See https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a for more information.

Please take some time to read that article it is worth reading.

This works for me :

ngrok http --host-header=rewrite PORT

for instance :

ngrok http --host-header=rewrite 4200

This was actually solved in one of the youtube video comments thanks to Mateusz Sawa

Go here to check it out.

-- specifyng a host in package.json does not work anymore --

just to note that it is not necessary to use the command that was used in the video, bellow instructions are enough to make the app work using regular angular-cli development

first you need to find the hosts in the etc/ folder

type cd .. in the console until you reach the root of the linux machine and check always with ls what is listed

if you see the hosts file, than you are in the right location and then use sudo vi hosts to edit it

add the line bellow all ip addresses " yourworkspace-yourusername.c9users.io" (without quotes of course :-) )

also in package.json change "start": "ng serve -H yourworkspace-yourusername.c9users.io"

then you just need to go to the application folder and start the app in the terminal with npm start

checked it just now and it worked

In my case, I use my host name to update /etc/hosts file.

vi /etc/hosts

and add your host name last line. myHostName.com

to connect my server,

ng serve -o

An error occurred when connecting to myHostName.com:4200.

so, I use like this,

ng serve --host --disableHostCheck true

Reconnecting to myHostName.com:4200 :)

Using the command below with the latest version of Angular CLI works for me.

ng serve --host --public-host <workspace>-<username>.c9users.io

I got same error. Public option solved problem for me like below:

ng serve --host --port 8080 --live-reload-port 8081 --public $C9_HOSTNAME

Below both solutions will work. In command line :

ng serve --public --host yourip --port yourportnumber

ng serve --host --port yourport --disableHostCheck true

Refer to: https://github.com/angular/angular-cli/issues/6070

use the public flag. for example: ng serve --host <workspace>-<username>.c9users.io --public

You should just change to your local IP address like and it should work.

ng serve --host

The thing is you can only access to link you have specified in --public parameter. In my case, I have provided the IP address in --public and trying to access it with the domain I registered against that IP. But ng binds it for the only host provided in --public.

To solve this problem, I supplied one more parameter: disable-host-check. Complete command: ng serve --disable-host-check --host --port 3100 --public x.x.x.x

To know more, click here

I was getting this error when trying to access our app using the localtunnel utility.

@tarn 's suggestion (from a comment on the accepted answer) of adding --disableHostCheck true to the ng serve command did the trick.

Here is solution if anybody still stuck in invalid host header issue:

Run ng eject it will create the webpack.config.js. Run npm install if it is asking. Add below "disableHostCheck":true to devServer in webpack.config.js. Like below:

"devServer": {
    "historyApiFallback": true,
    "disableHostCheck" : true //<-- add this line

Then in package.json file change start option under ng like this

"start": "webpack-dev-server --host --port YOURPORT --public YOURIP:YOURPORT"

Now run the angular with npm start command. Thats it.

In angular.json, add the following under architect -> serve -> options

"disableHostCheck": true

Got the answe from this Github Issue Page

Give this a shot

ng serve --host <private IP> --port <host port> --public-host <public IP>

Change the line 425 in file "node_modules/webpack-dev-server/lib/Server.js" from false to true. i.e,

Before: return false;

Updated: return true;

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