How to stream a vector of bytes to BufWriter?

I'm trying to stream bytes to a tcp server by using io::copy(&mut reader, &mut writer), but it gives me this error: the trait "std::io::Read" is not implemented for "Vec<{integer}>". Here I have a vector of bytes which would be the same as me opening a file and converting it to bytes. I want to write the bytes to the BufWriter. What am I doing wrong?

use std::io;
use std::net::TcpStream;
use std::io::BufWriter;

pub fn connect() {
    if let Ok(stream) = TcpStream::connect("localhost:8080") {
        println!("Connection established!");
        let mut reader = vec![
            137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 0, 70, 0, 0, 0, 70,
        ];
        let mut writer = BufWriter::new(&stream);
        io::copy(&mut reader, &mut writer).expect("Failed to write to stream");
    } else {
        println!("Couldn't connect to the server")
    }
}

error[E0277]: the trait bound `Vec<{integer}>: std::io::Read` is not satisfied
  --> src/lib.rs:12:31
   |
12 |         io::copy(&mut reader, &mut writer).expect("Failed to write to stream");
   |         --------              ^^^^^^^^^^^ the trait `std::io::Read` is not implemented for `Vec<{integer}>`
   |         |
   |         required by a bound introduced by this call
   |
note: required by a bound in `std::io::copy`

Solution

the compiler have a little trouble here, Vec doesn't implement Read but &[u8] do, you just have a get a slice from the vec before create a mutable reference:

copy(&mut reader.as_slice(), &mut writer).expect("Failed to write to stream");