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## Why #31335 lets HTTP callers obtain proxy-aware clients from `HttpClientFactory`, but a non-HTTP transport such as WebSockets also needs two pieces of policy owned by `codex-http-client`: a concrete route decision for its destination and the same custom-CA-aware rustls trust configuration used by HTTPS. Keeping these prerequisites in the shared abstraction means the dependent Responses WebSocket change (#31441) cannot independently reinterpret `features.respect_system_proxy`, PAC results, or enterprise CA settings. ## What changed - Add a redaction-safe `OutboundProxyRoute` with explicit transport-default, direct, and concrete-proxy outcomes. - Add `HttpClientFactory::resolve_proxy_route()` so transports can resolve a destination through the already-selected outbound proxy policy. - Resolve `ws://` and `wss://` URLs through their HTTP equivalents so system and PAC rules apply consistently. - Add an always-returned rustls config builder that starts from native roots and layers in any configured Codex custom CA bundle. The existing optional builder remains available to callers that can delegate the default configuration to their transport. - Continue redacting proxy URLs from `Debug` output because they may contain credentials. ## Review guide 1. `http-client/src/outbound_proxy.rs` defines the transport-neutral route result and WebSocket URL normalization. 2. `http-client/src/custom_ca.rs` factors the native-root/custom-CA construction so callers that perform TLS themselves can always obtain a config. 3. `http-client/src/outbound_proxy_tests.rs` verifies WebSocket normalization and legacy transport-default behavior. ## Test plan - `just test -p codex-http-client outbound_proxy` - `just test -p codex-http-client custom_ca` --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/31342). * #31431 * #31363 * #31362 * #31361 * #31442 * #31441 * __->__ #31342
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Why
ModelClientalready carries theHttpClientFactoryresolved from session configuration, but realtime call creation and memory summarization still constructed the legacy default client directly. Consequently, those first-party API requests could ignorefeatures.respect_system_proxyeven when Responses traffic honored it.These are the final direct default-client constructions in
core/src/client.rs, so they form one small migration unit on top of #31361.What changed
build_responses_transporttobuild_api_transport./realtime/callsdestination./memories/trace_summarizethrough the same helper.build_reqwest_clientimport.Review guide
core/src/client.rsis mechanical and keeps existing Responses behavior unchanged.api_provider_override.Validation
cargo check --tests -p codex-corejust fix -p codex-coreFollow-up
Direct HTTP clients outside
ModelClientremain separate migration slices.Stack created with Sapling. Best reviewed with ReviewStack.