fix(http): fix encoding when buffer is full

src/http/conn.rs

@@ -803,6 +803,8 @@ mod tests {
 
     #[test]
     fn test_conn_body_write_length() {
+        extern crate pretty_env_logger;
+        let _ = pretty_env_logger::init();
         let _: Result<(), ()> = future::lazy(|| {
             let io = AsyncIo::new_buf(vec![], 0);
             let mut conn = Conn::<_, http::Chunk, ServerTransaction>::new(io, Default::default());