Constant MAX_CACHE_MAX_BODY_BYTES 

pub const MAX_CACHE_MAX_BODY_BYTES: u64 = _; // 16_777_216u64

Upper bound for cache.max_body_bytes (DW-037): 16 MiB. A cache entry is a buffered body; the ceiling keeps one route’s policy from opting the gateway into buffering near-streaming payloads.