html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/datasette/issues/873#issuecomment-651193131,https://api.github.com/repos/simonw/datasette/issues/873,651193131,MDEyOklzc3VlQ29tbWVudDY1MTE5MzEzMQ==,9599,2020-06-29T15:27:00Z,2020-06-29T15:27:00Z,OWNER,"Aha! Yes it's not being called, and the reason is this: https://github.com/encode/starlette/issues/486

Short version: by default an exception raised during that phase is silently swallowed! You can avoid the swallowing by adding `lifespan=""on""` to the call to `uvicorn.run()`.

When I did that here:

`uvicorn.run(ds.app(), host=host, port=port, log_level=""info"", lifespan=""on"")`

The server failed to start with this error:

```
INFO:     Started server process [68849]
INFO:     Waiting for application startup.
ERROR:    Exception in 'lifespan' protocol
Traceback (most recent call last):
  File "".../uvicorn/lifespan/on.py"", line 48, in main
    await app(scope, self.receive, self.send)
  File "".../uvicorn/middleware/proxy_headers.py"", line 45, in __call__
    return await self.app(scope, receive, send)
  File "".../datasette_debug_asgi.py"", line 9, in wrapped_app
    if scope[""path""] == ""/-/asgi-scope"":
KeyError: 'path'
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",647095487,