bind to ipv6 too

src/main.rs

@@ -216,9 +216,17 @@ async fn main() -> std::io::Result<()> {
     })
     .bind((
         if reverse_proxy {
-            "127.0.0.1"
+            std::net::Ipv4Addr::LOCALHOST
         } else {
-            "0.0.0.0"
+            std::net::Ipv4Addr::UNSPECIFIED
+        },
+        port,
+    ))?
+    .bind((
+        if reverse_proxy {
+            std::net::Ipv6Addr::LOCALHOST
+        } else {
+            std::net::Ipv6Addr::UNSPECIFIED
         },
         port,
     ))?