Generate typed SSE transport and upgrade reqwest 0.13

[lightsofapollo]

Summary

• replace generated reqwest-eventsource usage with a conditional standalone sse.rs transport
• expose raw and typed SseEvent<T> streams while preserving the existing payload-only stream<T> API
• support SSE id and retry metadata, bounded reconnection, and Last-Event-ID resumption
• preserve OpenAI [DONE] handling and Anthropic named event lifecycles
• upgrade generated dependencies to reqwest 0.13, reqwest-middleware 0.5, reqwest-retry 0.9, reqwest-tracing 0.7, and thiserror 2
• infer reqwest 0.13 and middleware 0.5 serialization/streaming features from the generated code

Why

reqwest-eventsource still depends on reqwest 0.12, which blocked the dependency upgrades tracked in #50. Generating the small SSE transport directly removes that coupling and gives generated clients control over framing, typing, response limits, and reconnection semantics. The generated and generator-owned HTTP stacks now resolve on reqwest 0.13.

Validation

• cargo test --all-features
• cargo clippy --lib --bins --all-features -- -D warnings
• cargo fmt --all -- --check
• generated dependency-fragment compile tests
• deterministic chunk-boundary and two-connection Last-Event-ID resume tests
• live OpenAI- and Anthropic-compatible streaming against http://192.168.68.55:1234
• packaged-crate install smoke and checked-in server example compilation

Closes #50.

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Project	Deployment	Actions	Updated (UTC)
openapi-to-rust	Ready	Preview, Comment	Jul 29, 2026 3:46pm