disable timeout_keep_alive: fixes #10625 #10510 #10474

[montyanderson]

This fix disables uvicorn's timeout_keep_alive option, replacing the default value of 5 with 0.

Additional notes and description of your changes

We encountered a lot of errors where generations were being prematurely errored, when used through the API.

This fix is based off the comment posted on #10625

[wzgrx]

This problem still exists

LocalProtocolError: Can't send data when our state is ERROR

ERROR: Exception in ASGI application
Traceback (most recent call last):
File "D:\stable-diffusion-webui\venv\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 428, in run_asgi
result = await app( # type: ignore[func-returns-value]
File "D:\stable-diffusion-webui\venv\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 78, in call
return await self.app(scope, receive, send)
File "D:\stable-diffusion-webui\venv\lib\site-packages\fastapi\applications.py", line 273, in call
await super().call(scope, receive, send)
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\applications.py", line 122, in call
await self.middleware_stack(scope, receive, send)
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\errors.py", line 184, in call
raise exc
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\errors.py", line 162, in call
await self.app(scope, receive, _send)
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\base.py", line 109, in call
await response(scope, receive, send)
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\responses.py", line 270, in call
async with anyio.create_task_group() as task_group:
File "D:\stable-diffusion-webui\venv\lib\site-packages\anyio_backends_asyncio.py", line 662, in aexit
raise exceptions[0]
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\responses.py", line 273, in wrap
await func()
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\base.py", line 134, in stream_response
return await super().stream_response(send)
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\responses.py", line 255, in stream_response
await send(
File "D:\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\errors.py", line 159, in _send
await send(message)
File "D:\stable-diffusion-webui\venv\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 512, in send
output = self.conn.send(event)
File "D:\stable-diffusion-webui\venv\lib\site-packages\h11_connection.py", line 468, in send
data_list = self.send_with_data_passthrough(event)
File "D:\stable-diffusion-webui\venv\lib\site-packages\h11_connection.py", line 483, in send_with_data_passthrough
raise LocalProtocolError("Can't send data when our state is ERROR")
h11._util.LocalProtocolError: Can't send data when our state is ERROR