python
29 lines · 1 tab
Priya Sharma
Jan 2026
1 tab
import re
class APIVersionMiddleware:
"""Extract API version from request and add to request object."""
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
# Try to extract from Accept header first
accept = request.META.get('HTTP_ACCEPT', '')
version_match = re.search(r'version=(\d+\.\d+)', accept)
if version_match:
request.api_version = version_match.group(1)
elif request.path.startswith('/api/v'):
# Extract from URL: /api/v2/...
parts = request.path.split('/')
if len(parts) > 2 and parts[2].startswith('v'):
request.api_version = parts[2][1:] # Remove 'v' prefix
else:
request.api_version = '1.0' # Default
else:
request.api_version = '1.0'
response = self.get_response(request)
response['API-Version'] = request.api_version
return response
1 file · python
Explain with highlit
API versioning via middleware provides clean URL routing. I extract version from Accept header or URL prefix and set it on the request object. Views can check request.api_version to return appropriate responses. For breaking changes, I maintain separate serializer classes per version. Middleware is cleaner than versioning libraries for simple cases. I default to latest version for backwards compatibility. This pattern centralizes version logic and keeps view code focused on business logic. For complex APIs, DRF's built-in versioning is more feature-complete.
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