报错 - httpx - ReadTimeout Cancelled by cancel scope 10e8024d0

报错信息

使用 httpx 测试 fastapi 编写的接口并发性，抱以下错误：

发生异常: ReadTimeout
Cancelled by cancel scope 10e8024d0
asyncio.exceptions.CancelledError: Cancelled by cancel scope 10e8024d0

During handling of the above exception, another exception occurred:

TimeoutError: 

During handling of the above exception, another exception occurred:

httpcore.ReadTimeout: 

The above exception was the direct cause of the following exception:

  File "/Users/xx/code/rqst_test/test.py", line 6, in fetch
    response = await client.get(url)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/xx/code/rqst_test/test.py", line 13, in main
    results = await asyncio.gather(*tasks)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/xx/code/rqst_test/test.py", line 17, in <module>
    asyncio.run(main())
httpx.ReadTimeout: 

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原因 response = await client.get(url) 没设置 timeout，设置完就可以了

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请求

import httpx
import asyncio

async def fetch(client, url):
    response = await client.get(url, timeout=60)
    return response.status_code

async def main():
    url = 'http://100.168.1.246:8003/long_task'
    async with httpx.AsyncClient() as client:
        tasks = [fetch(client, url) for _ in range(100)]  # 并发100个请求
        results = await asyncio.gather(*tasks)
        print(results)

if __name__ == "__main__":
    asyncio.run(main())

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FastAPI 接口代码

如下：

import json
import asyncio
from fastapi import FastAPI
from fastapi.responses import JSONResponse

sum = 0

app = FastAPI()
@app.get("/")
def read_main():
    return {"message": "Hello !"}


@app.get("/long_task")
async def long_task():
    
    global sum 
    sum += 1
    
    print('---- long-task ', sum )  
    await asyncio.sleep(10)  
    print('---- completed ', sum )   
     
    return {"message": f"Task {sum} completed"}     

        
import os
PORT = 8003
if __name__ == '__main__':
    import uvicorn

    script = f'lsof -t -i tcp:{PORT} | xargs kill -9'
    os.system(script)
    uvicorn.run(app, host='0.0.0.0', port=PORT)

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