SessionMiddleware uses an explicit path=..., instead of defaulting to the ASGI 'root_path'. #1512
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Closes #1261
This pull request reverts #1147.
I'd obviously made the wrong call on that.
The intent was "okay, let's limit the path against which session cookies are applied. Our server might be submounted to a given path, and we shouldn't cookie to / in that case." - Which is reasonable enough idea if it only applied to where the main app was mounted, but as it happens actually just breaks all sorts of cases for us. Because we allow for submounted apps too.
Instead we support a configurable path="/" on SessionMiddleware. This doesn't magically pick up any root path that the server might be mounted to, but does allow users to configure the path if they need too.
Also refs #233, #1351.
Prompted by this discussion.