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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
Model discovery is a startup-critical request path, but it still constructed a default
reqwestclient directly. That meantfeatures.respect_system_proxycould apply to Responses API traffic while/modelscatalog refreshes bypassed the same resolved proxy policy.This is the next focused migration on top of #31342. It makes the proxy decision mandatory at the model-provider boundary rather than adding another optional flag a caller could omit.
What changed
HttpClientFactorywhen constructing aModelProvidermodels manager.Configthroughcodex-coreinto the OpenAI models endpoint./modelstransport with the route-aware API client and the full request destination.ReqwestDefaultpolicy.Review guide
model-provider/src/provider.rsadds the required factory to the provider API.model-provider/src/models_endpoint.rsis the behavior change that routes/modelsthrough the shared client policy.core/src/thread_manager.rssupplies the feature-derived factory; the remaining edits update test and alternate-provider construction.Validation
cargo check --tests -p codex-model-provider -p codex-core -p codex-memories-writejust test -p codex-model-provider(50 tests passed)Follow-up
Other direct
reqwestconsumers will be migrated in separate, reviewable stack entries.Stack created with Sapling. Best reviewed with ReviewStack.