Invalid HTTP_HOST header Django

Why This Happens

In Django, the request's host header isn't in allowed_hosts. This is one of the most common Django errors developers encounter. Understanding the root cause helps you fix it quickly and prevent it from recurring.

The Problem

# Request to bugsly.dev but ALLOWED_HOSTS = []

The Fix

ALLOWED_HOSTS = ['bugsly.dev', 'www.bugsly.dev']

Step-by-Step Fix

1. 1

   Identify the error

   Look at the error message: DisallowedHost. This tells you exactly what went wrong.

2. 2

   Find the cause

   Check the stack trace to find which line of your Django code triggered this error.

3. 3

   Apply the fix

   Use the corrected code pattern shown above. Test to confirm the error is resolved.