Preserve request bodies in test-proxy passthrough via request cloning

Preserve request bodies in test-proxy passthrough via request cloning targets a $18.4B = 23M professional developers x $800 avg annual spend on dev/test tooling total addressable market with medium saturation and a year-over-year growth rate of 12% (developer tools & testing market growth).

Key trends driving demand: Microservices & serverless -- fragmentation of backend systems increases need for robust local proxies and service virtualization to keep tests deterministic.; Shift-left testing -- teams require reliable, fast, and reproducible integration tests locally and in CI, driving demand for record/replay and passthrough safety.; Framework streaming semantics -- frameworks that consume request bodies as streams (e.g., Next.js edge/experimental APIs) expose new failure modes for naive proxies, creating a compatibility niche.; AI-assisted test generation -- models can convert recorded traffic into mocks and contract tests, raising the value of aggregated interaction datasets..