Constant DEFAULT_MAX_MIRRORED_H2_CONNECTION_CREDIT 

pub const DEFAULT_MAX_MIRRORED_H2_CONNECTION_CREDIT: u32 = _ /* 16_777_216u32 */;

Available on crate feature http-backend only.

The default for HttpMitmRelay::with_max_mirrored_h2_connection_credit; browsers ask for up to about 15 MiB.