Question
Answer and Explanation
To enable cookies in aiohttp, you typically don't need to "enable" them explicitly. aiohttp handles cookies automatically by default. However, you need to understand how to send and receive cookies using aiohttp's client and server functionalities. Here's a breakdown of how to work with cookies in aiohttp:
1. Client-Side Cookie Handling (Sending Cookies):
When making requests with aiohttp's client, cookies are automatically sent if they are stored in the client's cookie jar. You can create a client session and manage cookies using the `aiohttp.ClientSession` class.
Example:
import aiohttp
import asyncio
async def main():
async with aiohttp.ClientSession() as session:
# Set a cookie manually (optional)
session.cookie_jar.update_cookies({'my_cookie': 'my_value'})
async with session.get('https://example.com') as response:
print(response.status)
print(await response.text())
# Cookies sent with the request are automatically handled
# Check cookies received from the server
print(session.cookie_jar)
asyncio.run(main())
In this example, the `ClientSession` automatically manages cookies. If the server sends back cookies, they are stored in the `session.cookie_jar` and will be sent with subsequent requests to the same domain.
2. Server-Side Cookie Handling (Receiving and Setting Cookies):
On the server side, aiohttp automatically parses cookies from incoming requests. You can access them through the `request.cookies` attribute. To set cookies in the response, you use the `web.Response` object.
Example:
from aiohttp import web
import asyncio
async def handle(request):
print("Received cookies:", request.cookies)
resp = web.Response(text="Hello, World!")
resp.set_cookie('server_cookie', 'server_value', httponly=True)
return resp
async def main():
app = web.Application()
app.add_routes([web.get('/', handle)])
runner = web.AppRunner(app)
await runner.setup()
site = web.TCPSite(runner, 'localhost', 8080)
await site.start()
print("Server started on http://localhost:8080")
await asyncio.Future()
if __name__ == '__main__':
asyncio.run(main())
In this server example, the `request.cookies` dictionary contains the cookies sent by the client. The `resp.set_cookie()` method is used to set a cookie in the response. The `httponly=True` flag makes the cookie inaccessible to JavaScript, enhancing security.
Key Points:
- Automatic Handling: aiohttp automatically handles cookie parsing and storage by default.
- ClientSession: Use `aiohttp.ClientSession` for managing cookies on the client side.
- request.cookies: Access cookies sent by the client on the server side using `request.cookies`.
- response.set_cookie(): Set cookies in the server response using `response.set_cookie()`.
- Cookie Jar: The `ClientSession` uses a cookie jar to store and manage cookies.
By understanding these concepts, you can effectively work with cookies in your aiohttp applications without needing to explicitly "enable" them.