diff --git a/src/main.rs b/src/main.rs
index fe41067..144f250 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,7 +21,6 @@
 const HELLO_BODY: &str = "hello, world\n";
 const AUTH_FAIL_BODY: &str = "proxy auth required\n";
 const HTTP2_ONLY_BODY: &str = "http2 required\n";
-const BAD_REQUEST_BODY: &str = "bad request\n";
 const MAX_FRAME: usize = 65536;
 const NUM_FIRST_PADDINGS: usize = 8;
 
@@ -204,7 +203,7 @@
         let (host, port) = match self.parse_connect_target(session.req_header()) {
             Ok(v) => v,
             Err(_) => {
-                session.respond_error(400).await;
+                let _ = session.respond_error(400).await;
                 return Ok(true);
             }
         };
@@ -463,6 +462,13 @@
     let _ = env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info"))
         .try_init();
 
+    let mut server = Server::new(Some(Opt::parse_args())).unwrap();
+    server.bootstrap();
+
+    let mut options = HttpServerOptions::default();
+    options.h2c = false;
+    options.allow_connect_method_proxying = true;
+
     let port = env::var("HKJ_PORT").unwrap_or_else(|_| "443".to_string());
     let username = env::var("HKJ_USERNAME").expect("HKJ_USERNAME is required");
     let password = env::var("HKJ_PASSWORD").expect("HKJ_PASSWORD is required");
@@ -472,13 +478,6 @@
     let cert_path = env::var("HKJ_CERT_PATH").expect("HKJ_CERT_PATH is required");
     let key_path = env::var("HKJ_KEY_PATH").expect("HKJ_KEY_PATH is required");
 
-    let mut server = Server::new(Some(Opt::parse_args())).unwrap();
-    server.bootstrap();
-
-    let mut options = HttpServerOptions::default();
-    options.h2c = false;
-    options.allow_connect_method_proxying = true;
-
     let proxy = ForwardProxy {
         username,
         password,