message: perf(http): increase size of initial buffer to 8kb
diff: @@ -8,7 +8,7 @@ use tokio_io::{AsyncRead, AsyncWrite};
  use http::{Http1Transaction, h1, MessageHead, ParseResult, DebugTruncate};
  use bytes::{BytesMut, Bytes};
  -const INIT_BUFFER_SIZE: usize = 4096;
  +const INIT_BUFFER_SIZE: usize = 8192;
  pub const MAX_BUFFER_SIZE: usize = 8192 + 4096 * 100;
  pub struct Buffered<T> {
  