Add a route-aware HTTP client pool - #34447
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## Why PAC and system-proxy resolution can select a different outbound route for each request URL. Request creation and route selection must use the same URL while still allowing transport clients to be reused. ## What changed - Add `RouteAwareClientPool` and a request builder that resolve the outbound proxy route when sending each request. - Reuse HTTP clients by resolved route, with a bounded cache of 16 routes. - Preserve request tracing, optional diagnostic logging, custom CA settings, Cloudflare cookies, and default transport redirect behavior. - Export route-aware response and error types, including status, timeout, and connection-error helpers. ## Testing Add tests for exact URL routing, client reuse and eviction, default redirects, and redaction of URL secrets from debug output. GitOrigin-RevId: a1688b64305a0bb276c371df63a039ccbe821b76
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Add a route-aware HTTP client pool
Why
PAC and system-proxy resolution can select a different outbound route for each
request URL. Request creation and route selection must use the same URL while
still allowing transport clients to be reused.
What changed
RouteAwareClientPooland a request builder that resolve the outboundproxy route when sending each request.
Cloudflare cookies, and default transport redirect behavior.
connection-error helpers.
Testing
Add tests for exact URL routing, client reuse and eviction, default redirects,
and redaction of URL secrets from debug output.