Fix error reading closed response body on redirect #6372
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Since we were not using the sigil error in CheckRedirect, an error was set and the response body closed. However since redirects don't return from the error condition, there were follow on errors later reading the response body. With the
http.ErrUseLastResponseerror we can simplify this a bit and the response body will not be closed.Removed test used knowledge of the prior behavior to inject a read error, this method will no longer work and will require larger refactoring to reintroduce the case.
close #6366
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