Add Request to on_headers callback #3269
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When using a Guzzle Pool, there is no way to understand which response arrived for
on_headers
callback. This pull requestaddresses this issue by passing a request as a second argument to the
on_headers
callback function, and thus we canunderstand to which request this response belongs.
There was a previous attempt to do the same, but PR was closed because it was stale #2828 . Here is an example of code: