Preserve contextvars context when handle httpclient response #3340
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Hello! We use contextvars and write some of them to JSON logs. Sometimes we see error logs
Exception after Future was cancelled. But from the log's context we couldn't find the place where it occured, only that it was related to tornado httpclient. After debugging, we noticed, that this log might be written with context of other tasks that also make HTTP requests. This PR is addressed to fix this issue.I'm not sure if any tests are needed here, but I can try to add if you think they are.