Resolve outbound proxy routes explicitly - #34435
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## Why System proxy discovery can block, and delegating fallback to each transport can repeat discovery or apply inconsistent environment proxy behavior. ## What changed - Resolve unavailable system proxy decisions to an explicit environment proxy or direct route, including `NO_PROXY` settings and WebSocket-specific fallbacks. - Add asynchronous system proxy resolution that uses cached decisions first and serializes blocking platform lookups on Windows and macOS. - Preserve `NO_PROXY` handling for WebSocket connections, including HTTP and HTTPS proxies, and hash proxy cache keys on every platform. ## Testing - Add coverage for explicit environment fallback, cached asynchronous resolution, and proxied or bypassed WebSocket connections. GitOrigin-RevId: 3b7cf170dcfe639eec53c3c1514f92bfcf13e7e9
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Resolve outbound proxy routes explicitly
Why
System proxy discovery can block, and delegating fallback to each transport can repeat discovery or apply inconsistent environment proxy behavior.
What changed
NO_PROXYsettings and WebSocket-specific fallbacks.NO_PROXYhandling for WebSocket connections, including HTTP and HTTPS proxies, and hash proxy cache keys on every platform.Testing