Bryce Anderson 741602050f Don't replace all 'connection' headers when sending h2c upgrade request (#7824) ... Motivation: There may be meaningful 'connection' headers that exist on a request that is used to attempt a HTTP/1.x upgrade request that will be clobbered. Modifications: HttpClientUpgradeHandler uses the `HttpHeaders.add` instead of `HttpHeaders.set` when adding the 'upgrade' field. Result: Fixes #7823, existing 'connection' headers are preserved.		2018-04-01 19:59:30 +02:00
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handler/codec	Don't replace all 'connection' headers when sending h2c upgrade request (#7824)	2018-04-01 19:59:30 +02:00