Server request's state is not cloned.

[asvetlov]

req.clone() call doesn't clone request state, changes made by req['key'] = val are not propagated to clone.

The solution is calling req._state.copy() in clone

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new