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FastAPI 响应迭代器正在阻止异步函数或后台任务

[英]FastAPI response iterator is blocking the async functions or background tasks

原文 2022-08-31 04:54:40 8 1 python/ async-await/ middleware/ fastapi/ background-task

I wanted to get the response body in a middleware in FastAPI.我想在 FastAPI 的中间件中获取响应主体。 I tried the method by using the following answer on stackoverflow: https://stackoverflow.com/a/71883126/19869027 But When I use the following code in the middleware,我通过在 stackoverflow 上使用以下答案尝试了该方法： https://stackoverflow.com/a/71883126/19869027但是当我在中间件中使用以下代码时，
response_body = [section async for section in response.body_iterator]
it blocks the background tasks I use in fastapi routes, and response is not generated till background task finishes.它阻止了我在 fastapi 路由中使用的后台任务，并且在后台任务完成之前不会生成响应。 It works fine if I remove middleware.如果我删除中间件，它工作正常。 Kindly suggest some solution.请提出一些解决方案。 Regards问候

1 个解决方案

I've encountered similar problem.我遇到过类似的问题。 Turns out it was caused by a bug in Starlette.原来这是由 Starlette 中的错误引起的。 Bumping FastAPI to version 0.87.0 fixed the issue for me.将 FastAPI 升级到版本 0.87.0 为我解决了这个问题。 Based on a very helpful comment by r1b: https://github.com/encode/uvicorn/issues/111#issuecomment-1369272260基于 r1b 的非常有用的评论： https://github.com/encode/uvicorn/issues/111#issuecomment-1369272260

FastAPI 异步后台任务阻塞其他请求？ - FastAPI asynchronous background tasks blocks other requests?

FastAPI后台任务和Celery任务有什么区别？ - What's the difference between FastAPI background tasks and Celery tasks?

当请求失败并且在 FastAPI 中引发 HTTPException 时如何添加后台任务？ - How to add background tasks when request fails and HTTPException is raised in FastAPI?

FastAPI/Starlette：如何处理后台任务中的异常？ - FastAPI/Starlette: How to handle exceptions inside background tasks?

异步功能意外地相互阻塞 - Async functions are unexpectedly blocking each other

在 Tornado 的阻塞上下文中调用异步函数 - Call async functions in blocking context in Tornado

如何在 Azure Functions 中使用 FastAPI 发送文件响应？ - how do i send a file response using FastAPI in Azure Functions?

运行两个异步功能而不会互相阻塞 - Run two async functions without blocking each other

如何在非装饰器 function 中将我的任务添加到 FastAPI 中的后台任务 - How to add my task to Background Tasks in FastAPI in non-decorator function

FastAPI 异步 class 依赖项 - FastAPI async class dependencies

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相关问题 FastAPI 异步后台任务阻塞其他请求？ - FastAPI asynchronous background tasks blocks other requests? FastAPI后台任务和Celery任务有什么区别？ - What's the difference between FastAPI background tasks and Celery tasks? 当请求失败并且在 FastAPI 中引发 HTTPException 时如何添加后台任务？ - How to add background tasks when request fails and HTTPException is raised in FastAPI? FastAPI/Starlette：如何处理后台任务中的异常？ - FastAPI/Starlette: How to handle exceptions inside background tasks? 异步功能意外地相互阻塞 - Async functions are unexpectedly blocking each other 在 Tornado 的阻塞上下文中调用异步函数 - Call async functions in blocking context in Tornado 如何在 Azure Functions 中使用 FastAPI 发送文件响应？ - how do i send a file response using FastAPI in Azure Functions? 运行两个异步功能而不会互相阻塞 - Run two async functions without blocking each other 如何在非装饰器 function 中将我的任务添加到 FastAPI 中的后台任务 - How to add my task to Background Tasks in FastAPI in non-decorator function FastAPI 异步 class 依赖项 - FastAPI async class dependencies

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