Function http_req::request::copy_until

pub fn copy_until<R: ?Sized>(
    reader: &mut R, 
    val: &[u8], 
    deadline: Instant
) -> Result<[Vec<u8>; 2], Error> where
    R: Read, 

Reads data from reader and checks for specified value. When data contains specified value or deadline is reached, stops reading. Returns read data as array of two vectors: elements before and after the val.