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write content length in Data.Render ( 4206)

write content length in Data.Render ( 4206): a task in repo2rlenv-commit-runtime-v2 (Harbor dataset). Title: Response body content length not set correctly when using Data renderer

The task

**Title:** Response body content length not set correctly when using `Data` renderer

Part of FineEnvs/repo2rlenv-commit-runtime.