Aiohttp Middleware for Random User Agent Selection

This function defines an Aiohttp middleware that randomly selects a user agent string and sets it in the request header for each request.

Technology Stack : Aiohttp-web, aiohttp, random

Code Type : Middleware

Code Difficulty : Intermediate

                
                    
def random_user_agent(request):
    import aiohttp
    import random
    from aiohttp import web

    user_agents = [
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3",
        "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15",
        "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.104 UBrowser/88.0.4324.104 Safari/537.36",
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36"
    ]

    def get_random_user_agent():
        return random.choice(user_agents)

    async def middleware_handler(request):
        request.headers['User-Agent'] = get_random_user_agent()
        return await request.next()

    return web.middleware(middleware_handler)