diff --git a/src/main.rs b/src/main.rs
index 34ba9bd..86f28d9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -130,11 +130,12 @@ async fn send_response<W: Write + Unpin>(url: &Url, mut stream: W) -> Result {
         }
     }
 
+    // Make sure the file opens successfully before sending the success header.
     let mut file = async_std::fs::File::open(&path).await?;
     
     // Send header.
     if path.extension() == Some(OsStr::new("gmi")) {
-        stream.write_all(b"20 text/gemini\r\n").await?;
+        respond(&mut stream, "20", &["text/gemini"]).await?;
     } else {
         let mime = tree_magic_mini::from_filepath(&path).ok_or("Can't read file")?;
         respond(&mut stream, "20", &[mime]).await?;