diff --git a/Cargo.toml b/Cargo.toml
index e23e345..901b475 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,5 +44,5 @@ sha2 = { version = "0.10.8", default-features = false }
 # encoding
 base64 = { version = "0.21.6" }
 
-# # for request and response headers
-# http = "1.0.0"
+# for request and response headers
+http = { version = "1.0.0" }
diff --git a/src/hyper_http_ext.rs b/src/hyper_http_ext.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/lib.rs b/src/lib.rs
index 705b79d..f399309 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 mod crypto;
+mod hyper_http_ext;
 mod message_component;
 mod signature_base;
 mod signature_params;
diff --git a/src/signature_base.rs b/src/signature_base.rs
index 4646f0c..f17efd4 100644
--- a/src/signature_base.rs
+++ b/src/signature_base.rs
@@ -10,6 +10,10 @@ struct SignatureBase {
 }
 
 impl SignatureBase {
+  /// Creates a new signature base from component lines and signature params
+  /// This should not be exposed to user and not used directly.
+  /// TODO: Use wrapper functions generating SignatureBase from base HTTP request and SignatureParamsBuilder itself instead when newly generating signature
+  /// TODO: When verifying signature, use wrapper functions generating SignatureBase from HTTP request containing signature params itself instead.
   pub(crate) fn try_new(
     component_lines: &Vec<HttpMessageComponent>,
     signature_params: &HttpSignatureParams,
@@ -35,6 +39,12 @@ impl SignatureBase {
       signature_params: signature_params.clone(),
     })
   }
+
+  /// Returns the signature base string as bytes to be signed
+  pub(crate) fn as_bytes(&self) -> Vec<u8> {
+    let string = self.to_string();
+    string.as_bytes().to_vec()
+  }
 }
 
 impl std::fmt::Display for SignatureBase {