Response: addHeader(): Pass by value, not reference

response.h

@@ -27,8 +27,8 @@ class Response
 		return this->html;
 	}
 
-	void addHeader(const std::string &key, const std::string &value);
-	static Response redirectTemporarily(const std::string &url);
+	void addHeader(std::string key, std::string value);
+	static Response redirectTemporarily(std::string url);
 
 	void setStatus(int status)
 	{