异步请求中aiohttp.client_exceptions模块的常见异常

aiohttp.client_exceptions模块定义了一些在异步请求过程中可能引发的异常。这些异常包括连接错误、HTTP错误、重定向错误等等。下面是aiohttp.client_exceptions模块中常见的异常及其使用例子。

1. ClientError

ClientError是所有客户端异常的基类。当发生客户端相关的异常时，将会抛出这个基类异常。

import aiohttp
from aiohttp import ClientError

async def get_data(url):
    async with aiohttp.ClientSession() as session:
        try:
            async with session.get(url) as response:
                data = await response.text()
                print(data)
        except ClientError as e:
            print("An error occurred:", e)

2. ConnectorError

当连接不能建立或连接被意外关闭时，将会引发ConnectorError异常。

import aiohttp
from aiohttp import ConnectorError

async def get_data(url):
    async with aiohttp.ClientSession() as session:
        try:
            async with session.get(url) as response:
                data = await response.text()
                print(data)
        except ConnectorError as e:
            print("Connection error:", e)

3. ServerTimeoutError

当服务器响应时间超过设定的超时时间时，将会引发ServerTimeoutError异常。

import aiohttp
from aiohttp import ServerTimeoutError

async def get_data(url):
    async with aiohttp.ClientSession() as session:
        try:
            async with session.get(url, timeout=10) as response:
                data = await response.text()
                print(data)
        except ServerTimeoutError as e:
            print("Server timeout:", e)

4. TooManyRedirects

当请求超过重定向的最大次数时，将会引发TooManyRedirects异常。

import aiohttp
from aiohttp import TooManyRedirects

async def get_data(url):
    async with aiohttp.ClientSession() as session:
        try:
            async with session.get(url, allow_redirects=False) as response:
                data = await response.text()
                print(data)
        except TooManyRedirects as e:
            print("Too many redirects:", e)

5. ClientHttpProxyError

当使用代理服务器发生故障时，将会引发ClientHttpProxyError异常。

import aiohttp
from aiohttp import ClientHttpProxyError

async def get_data(url):
    proxy = "http://proxy.example.com:8080"
    async with aiohttp.ClientSession() as session:
        try:
            async with session.get(url, proxy=proxy) as response:
                data = await response.text()
                print(data)
        except ClientHttpProxyError as e:
            print("Proxy error:", e)

6. ContentTypeError

当请求的内容类型与响应的内容类型不匹配时，将会引发ContentTypeError异常。

import aiohttp
from aiohttp import ContentTypeError

async def get_data(url):
    async with aiohttp.ClientSession() as session:
        headers = {"Content-Type": "application/json"}
        try:
            async with session.post(url, json={"key": "value"}, headers=headers) as response:
                data = await response.text()
                print(data)
        except ContentTypeError as e:
            print("Content type error:", e)

这些是aiohttp.client_exceptions模块中一些常见的异常及其使用例子。当在异步请求过程中遇到这些异常时，可以根据具体情况捕获并处理这些异常，以保证程序的正常运行。