flask 是同步阻塞框架 fastapi 是异步非阻塞框架
如果直接 flask run 会报
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
这个警告, 解决方法是使用 gunicorn 来启动应用
gunicorn -w 4 'main:app'
上面的命令启动应用的同时也会开启4个线程
fastapi的启动方式则为
uvicorn main:app --port 5005
我也尝试使用uvicorn去启动 flask应用, 则直接报错
ERROR: Exception in ASGI application
Traceback (most recent call last):
File "/Users/blank/Library/Caches/pypoetry/virtualenvs/hello-FYQonWHQ-py3.10/lib/python3.10/site-packages/uvicorn/protocols/http/h11_impl.py", line 408, in run_asgi
result = await app( # type: ignore[func-returns-value]
File "/Users/blank/Library/Caches/pypoetry/virtualenvs/hello-FYQonWHQ-py3.10/lib/python3.10/site-packages/uvicorn/middleware/proxy_headers.py", line 84, in __call__
return await self.app(scope, receive, send)
File "/Users/blank/Library/Caches/pypoetry/virtualenvs/hello-FYQonWHQ-py3.10/lib/python3.10/site-packages/uvicorn/middleware/asgi2.py", line 16, in __call__
instance = self.app(scope)
TypeError: Flask.__call__() missing 1 required positional argument: 'start_response'
INFO: 127.0.0.1:52620 - "GET / HTTP/1.1" 500 Internal Server Error
ERROR: Exception in ASGI application
Traceback (most recent call last):
File "/Users/blank/Library/Caches/pypoetry/virtualenvs/hello-FYQonWHQ-py3.10/lib/python3.10/site-packages/uvicorn/protocols/http/h11_impl.py", line 408, in run_asgi
result = await app( # type: ignore[func-returns-value]
File "/Users/blank/Library/Caches/pypoetry/virtualenvs/hello-FYQonWHQ-py3.10/lib/python3.10/site-packages/uvicorn/middleware/proxy_headers.py", line 84, in __call__
return await self.app(scope, receive, send)
File "/Users/blank/Library/Caches/pypoetry/virtualenvs/hello-FYQonWHQ-py3.10/lib/python3.10/site-packages/uvicorn/middleware/asgi2.py", line 16, in __call__
instance = self.app(scope)
TypeError: Flask.__call__() missing 1 required positional argument: 'start_response'
INFO: 127.0.0.1:52621 - "GET /favicon.ico HTTP/1.1" 500 Internal Server Error
应该是协议不兼容
尝试用 gunicorn 启动 fastapi 应用的话, 也会报错
[2023-10-05 18:16:12 +0800] [38568] [ERROR] Error handling request /
Traceback (most recent call last):
File "/Users/blank/Library/Caches/pypoetry/virtualenvs/app-6mKjmJHg-py3.10/lib/python3.10/site-packages/gunicorn/workers/sync.py", line 135, in handle
self.handle_request(listener, req, client, addr)
File "/Users/blank/Library/Caches/pypoetry/virtualenvs/app-6mKjmJHg-py3.10/lib/python3.10/site-packages/gunicorn/workers/sync.py", line 178, in handle_request
respiter = self.wsgi(environ, resp.start_response)
TypeError: FastAPI.__call__() missing 1 required positional argument: 'send'
