Function encode_params 

pub fn encode_params<'a, I>(pairs: I) -> Result<BytesMut, ProtocolError>
where
    I: IntoIterator<Item = NvPairRef<'a>>,

Available on crate feature fastcgi only.

Encode a list of name-value pairs into a BytesMut buffer.

Returns ProtocolError::ContentTooLarge if any pair contains a name or value longer than MAX_NV_LENGTH (2^31 − 1).