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* fix: check Content-Length before downloading HTTP response body The HTTP tool previously downloaded the entire response body into memory before checking the size limit, allowing a malicious server to cause OOM. Now the Content-Length header is checked first to reject obviously oversized responses, and the body is streamed with a hard size cap so reading stops as soon as the limit is exceeded. * fix: check chunk size before allocation and fix Content-Length parsing Address review feedback: - Check body.len() + chunk.len() before extend_from_slice to prevent OOM from a single oversized chunk - Use let-chain for Content-Length parsing instead of unwrap_or to gracefully handle invalid headers * docs: document MAX_RESPONSE_SIZE rationale and add tracing on rejection Address review feedback: explain why 5 MB was chosen for the response size limit and log a warning when Content-Length causes early rejection. --------- Co-authored-by: Yi LIU <[email protected]>