Function max_request_body_bytes 

pub fn max_request_body_bytes() -> usize

The server-wide buffered request body cap in bytes, from FAKECLOUD_MAX_REQUEST_BODY_BYTES (default 1 GiB). Public so buffered sub-proxies (e.g. the CloudFront viewer data plane) apply the SAME cap as direct traffic rather than an inconsistent limit of their own.