I've run into this exact issue before, so let's walk through the most likely fixes step by step:

1. Add the Required API Key Middleware (Most Common Culprit) #

You've added rest_framework_api_key to INSTALLED_APPS, but you're missing the critical middleware that lets the framework parse the API key from your request headers. Update your mysite/settings.py MIDDLEWARE list:

MIDDLEWARE = [
    # Keep your existing middleware here
    'django.contrib.admin...',
    # ...
    'rest_framework_api_key.middleware.APIKeyMiddleware',  # Add this line
]

Without this middleware, the HasAPIKey permission class can't access the API key from the request, so it automatically returns a 403.

2. Correct the API_KEY_CUSTOM_HEADER Setting #

Your current config uses API_KEY_CUSTOM_HEADER = "HTTP_X_API_KEY", but this setting expects the raw request header name, not Django's transformed version. Django automatically converts headers like X-Api-Key to HTTP_X_API_KEY internally, so your setting should be:

API_KEY_CUSTOM_HEADER = "X-Api-Key"

This ensures the framework looks for the exact header you're sending in Postman.

3. Verify Your API Key's Status #

Even if the key exists, double-check these properties in your Django admin or via the shell:

• Make sure revoked is set to False for the OrganizationAPIKey object
• Confirm expiry_date is either None (permanent) or hasn't passed yet

Test with a quick shell command:

from api.models import OrganizationAPIKey
# Replace with your key's prefix
key = OrganizationAPIKey.objects.get(prefix="your-key-prefix")
print(f"Revoked: {key.revoked}, Expires: {key.expiry_date}")

4. Double-Check Postman Request Details #

• Ensure your request header is exactly X-Api-Key (case doesn't strictly matter for HTTP, but matching exactly avoids edge cases)
• Make sure you're using the full key generated when you created the API key (not just the prefix)
• Confirm your POST body is valid JSON (e.g., {"name": "Test Client"})—invalid payloads can sometimes mask authentication issues

5. Update the DRF API Key Package #

Old versions of djangorestframework-api-key had minor bugs around header parsing. Try upgrading to the latest version:

pip install --upgrade djangorestframework-api-key

Start with adding the middleware first—9 times out of 10, that's the missing piece here.

内容的提问来源于stack exchange，提问作者Subhankar Halder