Snippet

Django Middleware for Request Timing

Middleware in Django sits between the web server and your views, processing every request/response. This custom middleware measures and logs the execution time of each request, adding the duration as a custom HTTP header for monitoring purposes.

snippet.py

python

import time
import logging
 
logger = logging.getLogger(__name__)
 
class RequestTimingMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
 
    def __call__(self, request):
        start_time = time.perf_counter()
        response = self.get_response(request)
        duration = time.perf_counter() - start_time
 
        logger.info(
            f"{request.method} {request.path} "
            f"completed in {duration:.4f}s"
        )
        response['X-Response-Time'] = f"{duration:.4f}s"
        return response

django

Breakdown

def __init__(self, get_response):

Middleware initialization receives the next middleware or view in the chain

def __call__(self, request):

This dunder method is called for every HTTP request, processing before and after the view

time.perf_counter()

High-resolution performance counter for accurate timing measurements

response['X-Response-Time'] = f"..."

Add custom header to response for client-side timing visibility

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Django Middleware for Request Timing

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