Solved: DisallowedHost – Invalid HTTP_HOST header

This error is related to “Installing Django and Django-REST Framework on ubuntu” , if you have Django application / server running on local ubuntu host as,

$ python manage.py runserver

Then this server is started with binding to your local loopback IP address and default port as,

Starting development server at http://127.0.0.1:8000/

Now, when you decide to use your IP address instead of local loopback and also change the port, you can start the webserver as,

$ python manage.py runserver 192.168.0.103:8080

Considering, your IP address is “192.168.0.103” (it can be different in your case) and port you want to use as “8080” ( This also can be different as you want)

Now, the server will get started but when you visit in browser as, http://192.168.0.103:8080/ you may see an error as,

DisallowedHost at /
Invalid HTTP_HOST header: ‘192.168.0.103:8080’. You may need to add ‘192.168.0.103’ to ALLOWED_HOSTS.

Request Method:	GET
Request URL:	http://192.168.0.103:8080/
Django Version:	3.0.7
Exception Type:	DisallowedHost
Exception Value:	Invalid HTTP_HOST header: ‘192.168.0.103:8080’. You may need to add ‘192.168.0.103’ to ALLOWED_HOSTS.

Solution :

Open YOUR_PROJECT/settings.py and add the IP address ( in our case 192.168.0.103) as,

ALLOWED_HOSTS = ['192.168.0.103']

and restart the server as,

$ python manage.py runserver 192.168.0.103:8080

Now, if you visit the URL in browser http://192.168.0.103:8080 , you should not see the error.