Serializing should not affect object

src/http/response.cpp

@@ -3,7 +3,7 @@
 
 namespace Http
 {
-	std::vector<char> Response::Serialize()
+	std::vector<char> Response::Serialize() const
 		{
 			// TODO implement headers properly
 			std::stringstream ss;

src/http/response.hpp

@@ -9,7 +9,7 @@ namespace Http
 		std::string contentType;
 		std::vector<char> content;
 
-		std::vector<char> Serialize();
+		std::vector<char> Serialize() const;
 
 		Response();
 	};