Fix bodyless request content length

[lightsofapollo]

Summary

• emit an explicit Content-Length: 0 header for bodyless POST, PUT, and PATCH operations
• cover operations with no request body, schema-less request bodies, and optional bodies passed as None
• leave GET, HEAD, DELETE, OPTIONS, and TRACE behavior unchanged

Root cause

Bodyless generated requests did not provide an explicit content length. Some gateways, including Google Front End, reject those requests with 411 Length Required. An explicit empty Reqwest body is not sufficient on the current Reqwest/Hyper stack because an already-ended empty body can still be sent without a Content-Length header.

Impact

Generated Rust method signatures and model APIs are unchanged. This only changes HTTP wire framing for bodyless POST, PUT, and PATCH requests.

Validation

• cargo fmt --all -- --check
• cargo clippy --all-features -- -D warnings
• cargo test --all-features

Fixes #43

[vercel]

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Project	Deployment	Actions	Updated (UTC)
openapi-to-rust	Ready	Preview, Comment	Jul 28, 2026 8:47pm