CommandError You must set settings ALLOWED HOSTS if DEBUG is False

Question

I m using Django 1 6 5 with the setting  DEBUG   True  When I change to DEBUG   False and run manage py runserver  I get the following error  CommandError  You must set settings ALLOWED HOSTS if DEBUG is False  I get the same error with the following setting  ALLOWED HOSTS     127 0 0 1    localhost    How can I fix this

User · Answer

Try   SECURITY WARNING  don t run with debug turned on in production  DEBUG   True  ALLOWED HOSTS          A value of     will match anything  in this case you are responsible to provide your own validation of the Host header

User · Answer

Use this  ALLOWED HOSTS      localhost    127 0 0 1

User · Answer

Make sure it s not redefined again lower down in your settings py  The default settings has   ALLOWED HOSTS

User · Answer

I also experienced this cmderror  After trying all the answers on here  I couldn t still figure out the problem  here is what I did   Cd into the project directory  e g cd project-dir I migrated  e g python manage py migrate I created a super user  e g python manage py createsuperuser Enter the desired info like username  password  email etc You should get a  quot super user created successfully quot  response Now run the server  E g python manage py runserver Click on the URL displayed The URL on your browser should look like this  127 0 0 1 8000 Quit Now edit the URL on your browser to this  127 0 0 1 8000 admin You should see an administrative login page Login with the super user info you created earlier on You should be logged in to the Django administration Now click on  quot view site quot  at the top of the page You should see a page which shows  quot the install worked successfully      Debug   True quot  Voila  your server is up and running

User · Answer

Your solution might be to add the original IP and or hostname also  ALLOWED HOSTS        localhost      127 0 0 1      111 222 333 444      mywebsite com    The condition to be satisfied is that the host header  or X-Forwarded-Host if USE X FORWARDED HOST is enabled  should match one of the values in ALLOWED HOSTS

User · Answer

Just simply comment out the line  ALLOWED HOSTS

User · Answer

This works for me    SECURITY WARNING  don t run with debug turned on in production  DEBUG   False  ALLOWED HOSTS     localhost    127 0 0 1

User · Answer

If you work in PyCharm  check the Environmental variables for your Django server  You should specify the proper module settings file

User · Answer

Try  ALLOWED HOSTS           Less secure if you re not firewalled off or on a public LAN  but it s what I use and it works   EDIT  Interestingly enough I ve been needing to add this to a few of my 1 8 projects even when DEBUG   True  Very unsure why   EDIT  This is due to a Django security update as mentioned in my comment

User · Answer

From documentation  https   docs djangoproject com en 1 10 ref settings      if DEBUG is False  you also need to properly set the ALLOWED HOSTS   setting  Failing to do so will result in all requests being returned   as    Bad Request  400        And from here  https   docs djangoproject com en 1 10 ref settings  std setting-ALLOWED HOSTS  I am using something like this   ALLOWED HOSTS     localhost    127 0 0 1    www mysite com

[django] CommandError: You must set settings.ALLOWED_HOSTS if DEBUG is False

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