如何解决aiohttp.client_exceptions.ClientConnectorError：无法连接到主机stackoverflow.com:443 ssl：default [连接呼叫失败（''151.101.193.69''，443）]？

这是我的代码：

import asyncio
import aiohttp


async def main():
    loop = asyncio.get_event_loop()
    url = "https://stackoverflow.com/"

    async with aiohttp.ClientSession(loop=loop) as session:
        async with session.get(url,timeout=30) as resp:
            print(resp.status)

asyncio.run(main())

如果我在计算机上运行它，一切正常，但是如果我在pythonanywhere上运行，则会出现此错误：

Traceback (most recent call last):
  File "/home/0dminnimda/.local/lib/python3.8/site-packages/aiohttp/connector.py",line 936,in _wrap_create_connection
    return await self._loop.create_connection(*args,**kwargs)  # type: ignore  # noqa
  File "/usr/lib/python3.8/asyncio/base_events.py",line 1017,in create_connection
    raise exceptions[0]
  File "/usr/lib/python3.8/asyncio/base_events.py",line 1002,in create_connection
    sock = await self._connect_sock(
  File "/usr/lib/python3.8/asyncio/base_events.py",line 916,in _connect_sock
    await self.sock_connect(sock,address)
  File "/usr/lib/python3.8/asyncio/selector_events.py",line 485,in sock_connect
    return await fut
  File "/usr/lib/python3.8/asyncio/selector_events.py",line 517,in _sock_connect_cb
    raise OSError(err,f''Connect call Failed {address}'')
ConnectionRefusedError: [Errno 111] Connect call Failed (''151.101.193.69'',443)
The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "test_c.py",line 39,in <module>
    asyncio.run(main())
  File "/usr/lib/python3.8/asyncio/runners.py",line 43,in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.8/asyncio/base_events.py",line 608,in run_until_complete
    return future.result()
  File "test_c.py",line 28,in main
    async with session.get(url,timeout=30) as resp:  #,headers=headers
  File "/home/0dminnimda/.local/lib/python3.8/site-packages/aiohttp/client.py",line 1012,in __aenter__
    self._resp = await self._coro
  File "/home/0dminnimda/.local/lib/python3.8/site-packages/aiohttp/client.py",line 480,in _request
    conn = await self._connector.connect(
  File "/home/0dminnimda/.local/lib/python3.8/site-packages/aiohttp/connector.py",line 523,in connect
    proto = await self._create_connection(req,traces,timeout)
  File "/home/0dminnimda/.local/lib/python3.8/site-packages/aiohttp/connector.py",line 858,in _create_connection
    _,proto = await self._create_direct_connection(
  File "/home/0dminnimda/.local/lib/python3.8/site-packages/aiohttp/connector.py",line 1004,in _create_direct_connection
    raise last_exc
  File "/home/0dminnimda/.local/lib/python3.8/site-packages/aiohttp/connector.py",line 980,in _create_direct_connection
    transp,proto = await self._wrap_create_connection(
  File "/home/0dminnimda/.local/lib/python3.8/site-packages/aiohttp/connector.py",line 943,in _wrap_create_connection
    raise client_error(req.connection_key,exc) from exc
aiohttp.client_exceptions.ClientConnectorError: Cannot connect to host stackoverflow.com:443 ssl:default [Connect call Failed (''151.101.193.69'',443)]
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x7f25a71d1a90>

1-托管上的aiohttp，2-我的计算机上的aiohttp

Name: aiohttp
Version: 3.6.2
Summary: Async http client/server framework (asyncio)
Home-page: https://github.com/aio-libs/aiohttp
Author: nikolay Kim
Author-email: fafhrd91@gmail.com
License: Apache 2
Location: /home/0dminnimda/.local/lib/python3.8/site-packages
Requires: chardet,async-timeout,multidict,yarl,attrs
required-by: 

Name: aiohttp
Version: 3.6.2
Summary: Async http client/server framework (asyncio)
Home-page: https://github.com/aio-libs/aiohttp
Author: nikolay Kim
Author-email: fafhrd91@gmail.com
License: Apache 2
Location: c:\users\asus\appdata\roaming\python\python38\site-packages
Requires: async-timeout,attrs,chardet,multidict
required-by: 

我很茫然，不是吗？我正在使用python3.8运行两个文件。

我也尝试了其他网址，它们有相同的问题

我需要添加更多详细信息吗？

解决方法

import asyncio
import aiohttp


async def main():
    loop = asyncio.get_event_loop()
    url = "https://stackoverflow.com/"

    async with aiohttp.ClientSession(loop=loop,trust_env=True) as session:
        async with session.get(url,timeout=30) as resp:
            print(resp.status)

asyncio.run(main())

import sys

...

policy = asyncio.WindowsSelectorEventLoopPolicy()
asyncio.set_event_loop_policy(policy)

asyncio.run(main())

import sys

...

if (sys.platform.startswith(''win'')
        and sys.version_info[0] == 3
        and sys.version_info[1] >= 8):
    policy = asyncio.WindowsSelectorEventLoopPolicy()
    asyncio.set_event_loop_policy(policy)

asyncio.run(main())

Application Installation Failed
Installation failed with message Failed to establish session.
It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.
WARNING: Uninstalling will remove the application data!
Do you want to uninstall the existing application?
=========
应用程序安装失败
安装失败，消息未能建立会话。
如果存在apk的现有版本，则可以通过卸载该版本来解决此问题，然后重新安装。
警告:卸载将删除应用程序数据!
要卸载现有应用程序吗?　

HttpRequestRetryHandler retryHandler = new HttpRequestRetryHandler() {            public boolean retryRequest(IOException e, int retryCount, HttpContext httpCtx) {                if (retryCount >= 3){                    Logger.warn(CALLER, "Maximum tries reached, exception would be thrown to outer block");                    return false;                }                if (e instanceof org.apache.http.NoHttpResponseException){                    Logger.warn(CALLER, "No response from server on "+retryCount+" call");                    return true;                }                return false;            }        };        httpPost.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, retryHandler);