fix(server): panic on max_buf_size too small

src/proto/h1/mod.rs

@@ -3,6 +3,7 @@ pub(crate) use self::dispatch::Dispatcher;
 pub use self::decode::Decoder;
 pub use self::encode::{EncodedBuf, Encoder};
 pub use self::io::Cursor; //TODO: move out of h1::io
+pub use self::io::MINIMUM_MAX_BUFFER_SIZE;
 
 mod conn;
 mod date;