aiogram/docs/api/client/session/aiohttp.md

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# Aiohttp session
AiohttpSession represents a wrapper-class around `ClientSession` from [aiohttp]('https://pypi.org/project/aiohttp/')
Currently `AiohttpSession` is a default session used in `aiogram.Bot`
## Usage example
```python
from aiogram import Bot
from aiogram.api.client.session.aiohttp import AiohttpSession
session = AiohttpSession()
Bot('token', session=session)
```
## Proxy requests in AiohttpSession
In order to use AiohttpSession with proxy connector you have to install [aiohttp-socks]('https://pypi.org/project/aiohttp-socks/')
Binding session to bot:
```python
from aiogram import Bot
from aiogram.api.client.session.aiohttp import AiohttpSession
session = AiohttpSession(proxy="protocol://host:port/")
Bot(token="bot token", session=session)
```
!!! note "Protocols"
Only following protocols are supported: http(tunneling), socks4(a), socks5 as aiohttp_socks documentation claims.
### Authorization
Proxy authorization credentials can be specified in proxy URL or come as an instance of `aiohttp.BasicAuth` containing
login and password.
Consider examples:
```python
from aiohttp import BasicAuth
from aiogram.api.client.session.aiohttp import AiohttpSession
auth = BasicAuth(login="user", password="password")
session = AiohttpSession(proxy=("protocol://host:port", auth))
# or simply include your basic auth credential in URL
session = AiohttpSession(proxy="protocol://user:password@host:port")
```
!!! note "Credential priorities"
Aiogram prefers `BasicAuth` over username and password in URL, so
if proxy URL contains login and password and `BasicAuth` object is passed at the same time
aiogram will use login and password from `BasicAuth` instance.
### Proxy chains
Since [aiohttp-socks]('https://pypi.org/project/aiohttp-socks/') supports proxy chains, you're able to use them in aiogram
Example of chain proxies:
```python
from aiohttp import BasicAuth
from aiogram.api.client.session.aiohttp import AiohttpSession
auth = BasicAuth(login="user", password="password")
session = AiohttpSession(
proxy={"protocol0://host0:port0",
"protocol1://user:password@host1:port1",
("protocol2://host2:port2", auth),} # can be any iterable if not set
)
```
## Location
- `from aiogram.api.client.session.aiohttp import AiohttpSession`