getting remote_addr when TimedOut error

[flisky]

I'm trying to log the remote_addr when request fails.

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I'm thinking the following two ways, but cannot figure it out:

• downcast reqwest::Error to hyper::Error, and inspect client_connect_info.

It turns out the TimedOut error is early turned by reqwest, not by hyper :(

• use hyper's capture_connection, but hyper::Request is not accessible from reqwest.

I think it's too much cost to use hyper's client instead of reqwest for much feature.

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Any suggestion? I'm glad to contribute a PR if needed.