diff --git a/src/response.rs b/src/response.rs
index 883abe6..8aa5284 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -84,7 +84,7 @@ fn test() {
         match target {
             Response::Success(ref this) => match this {
                 Success::Default(this) => {
-                    assert_eq!(this.mime, "text/gemini".to_string());
+                    assert_eq!(this.header.mime, "text/gemini");
                     assert_eq!(this.data, "data".as_bytes());
                 }
             },
@@ -99,7 +99,7 @@ fn test() {
 
         match target {
             Response::Redirect(ref this) => match this {
-                Redirect::Temporary(this) => assert_eq!(this.target, "target".to_string()),
+                Redirect::Temporary(this) => assert_eq!(this.target, "target"),
                 _ => panic!(),
             },
             _ => panic!(),
@@ -113,7 +113,7 @@ fn test() {
 
         match target {
             Response::Redirect(ref this) => match this {
-                Redirect::Permanent(this) => assert_eq!(this.target, "target".to_string()),
+                Redirect::Permanent(this) => assert_eq!(this.target, "target"),
                 _ => panic!(),
             },
             _ => panic!(),
diff --git a/src/response/success.rs b/src/response/success.rs
index 4bfd3bd..2ef9605 100644
--- a/src/response/success.rs
+++ b/src/response/success.rs
@@ -30,13 +30,13 @@ impl<'a> Success<'a> {
 
 #[test]
 fn test() {
-    let request = format!("20 text/gemini\r\ndata");
+    let request = format!("20 text/gemini\r\nDATA");
     let source = Success::from_bytes(request.as_bytes()).unwrap();
 
     match source {
         Success::Default(ref this) => {
-            assert_eq!(this.mime, "text/gemini".to_string());
-            assert_eq!(this.data, "data".as_bytes());
+            assert_eq!(this.header.mime, "text/gemini");
+            assert_eq!(this.data, "DATA".as_bytes());
         }
     }
     assert_eq!(source.into_bytes(), request.as_bytes());
diff --git a/src/response/success/default.rs b/src/response/success/default.rs
index ffef86e..1a1fae7 100644
--- a/src/response/success/default.rs
+++ b/src/response/success/default.rs
@@ -1,45 +1,27 @@
-use anyhow::{bail, Result};
-
-pub const CODE: &[u8] = b"20";
+pub mod header;
+pub use header::Header;
 
 /// [Success](https://geminiprotocol.net/docs/protocol-specification.gmi#success)
 pub struct Default<'a> {
-    pub mime: String,
     pub data: &'a [u8],
+    pub header: Header,
 }
 
 impl<'a> Default<'a> {
     /// Build `Self` from UTF-8 header bytes
     /// * expected buffer includes leading status code, message, CRLF
     pub fn from_bytes(buffer: &'a [u8]) -> Result<Self> {
-        use crate::Header;
-        use regex::Regex;
-        use std::str::from_utf8;
-        let h = buffer.header_bytes()?;
-        if h.get(..2)
-            .is_none_or(|c| c[0] != CODE[0] || c[1] != CODE[1])
-        {
-            bail!("Invalid status code")
-        }
+        let header = Header::from_bytes(buffer)?;
         Ok(Self {
-            mime: match Regex::new(r"^([^\/]+\/[^\s;]+)")?.captures(from_utf8(&h[3..])?) {
-                Some(c) => match c.get(1) {
-                    Some(m) => m.as_str().to_string(),
-                    None => bail!("Content type required"),
-                },
-                None => bail!("Could not parse content type"),
-            },
-            data: &buffer[h.len() + 2..],
+            data: buffer.get(header.to_bytes().len()..).unwrap_or(&[]),
+            header,
         })
     }
 
     /// Convert `Self` into UTF-8 bytes presentation
     pub fn into_bytes(self) -> Vec<u8> {
-        let mut bytes = Vec::with_capacity(3 + self.mime.len() + 2 + self.data.len());
-        bytes.extend(CODE);
-        bytes.push(b' ');
-        bytes.extend(self.mime.into_bytes());
-        bytes.extend([b'\r', b'\n']);
+        let mut bytes = Vec::new();
+        bytes.extend(self.header.into_bytes());
         bytes.extend(self.data);
         bytes
     }
@@ -47,10 +29,11 @@ impl<'a> Default<'a> {
 
 #[test]
 fn test() {
-    let source = format!("20 text/gemini\r\ndata");
-    let target = Default::from_bytes(source.as_bytes()).unwrap();
+    const BYTES: &[u8] = "20 text/gemini\r\nDATA".as_bytes();
+    let default = Default::from_bytes(BYTES).unwrap();
 
-    assert_eq!(target.mime, "text/gemini".to_string());
-    assert_eq!(target.data, "data".as_bytes());
-    assert_eq!(target.into_bytes(), source.as_bytes());
+    assert_eq!(default.header.mime, "text/gemini".to_string());
+    assert_eq!(default.into_bytes(), BYTES);
 }
+
+use anyhow::Result;
diff --git a/src/response/success/default/header.rs b/src/response/success/default/header.rs
new file mode 100644
index 0000000..4c1d4f7
--- /dev/null
+++ b/src/response/success/default/header.rs
@@ -0,0 +1,55 @@
+pub const CODE: &[u8] = b"20";
+
+pub struct Header {
+    pub mime: String,
+}
+
+impl Header {
+    /// Build `Self` from UTF-8 header bytes
+    /// * expected buffer includes leading status code, message, CRLF
+    pub fn from_bytes(buffer: &[u8]) -> Result<Self> {
+        use crate::Header;
+        use regex::Regex;
+        use std::str::from_utf8;
+        let h = buffer.header_bytes()?;
+        if h.get(..2)
+            .is_none_or(|c| c[0] != CODE[0] || c[1] != CODE[1])
+        {
+            bail!("Invalid status code")
+        }
+        Ok(Self {
+            mime: match Regex::new(r"^([^\/]+\/[^\s;]+)")?.captures(from_utf8(&h[3..])?) {
+                Some(c) => match c.get(1) {
+                    Some(m) => m.as_str().to_string(),
+                    None => bail!("Content type required"),
+                },
+                None => bail!("Could not parse content type"),
+            },
+        })
+    }
+
+    /// Convert `Self` into UTF-8 bytes presentation
+    pub fn into_bytes(self) -> Vec<u8> {
+        self.to_bytes()
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let mut bytes = Vec::with_capacity(3 + self.mime.len() + 2);
+        bytes.extend(CODE);
+        bytes.push(b' ');
+        bytes.extend(self.mime.as_bytes());
+        bytes.extend([b'\r', b'\n']);
+        bytes
+    }
+}
+
+#[test]
+fn test() {
+    const BYTES: &[u8] = "20 text/gemini\r\nDATA".as_bytes();
+    let header = Header::from_bytes(BYTES).unwrap();
+
+    assert_eq!(header.mime, "text/gemini".to_string());
+    assert_eq!(header.into_bytes(), BYTES[..BYTES.len() - 4]); // skip DATA
+}
+
+use anyhow::{bail, Result};