fix setting cookies

response.hpp

@@ -4,6 +4,7 @@
 #include <string>
 #include <string_view>
 #include <unordered_map>
+#include <vector>
 #include <array>
 
 using std::string_view;
@@ -13,6 +14,7 @@ struct Response {
 	std::string body;
 	std::string content_type = "text/plain";
 	std::unordered_map<std::string, std::string> headers;
+	std::vector<std::string> cookies;
 
 	void set_json(const std::string& json) {
 		body = json;
@@ -33,12 +35,12 @@ struct Response {
 	void set_cookie(string_view name, string_view value, int max_age = -1,
 		string_view path = "", string_view domain = "", bool secure = false, bool http_only = false) {
 		std::string cookie_header = CookieHelpers::build_set_cookie(name, value, max_age, path, domain, secure, http_only);
-		headers["Set-Cookie"] = cookie_header;
+		cookies.push_back(cookie_header);
 	}
 
 	void delete_cookie(string_view name, string_view path = "") {
 		std::string cookie_header = CookieHelpers::build_delete_cookie(name, path);
-		headers["Set-Cookie"] = cookie_header;
+		cookies.push_back(cookie_header);
 	}
 };
 
@@ -95,6 +97,13 @@ public:
 			result += "\r\n";
 		}
 
+		// Multiple Set-Cookie headers
+		for (const auto& cookie : response.cookies) {
+			result += "Set-Cookie: ";
+			result += cookie;
+			result += "\r\n";
+		}
+
 		// Connection handling
 		bool keep_alive = version != "HTTP/1.0";
 		if (response.headers.find("Connection") == response.headers.end()) {

server.hpp

@@ -193,7 +193,7 @@ private:
 		}
 
 		void set_session_cookie(Response& response, const std::string& session_id) {
-			response.headers["Set-Cookie"] = "session_id=" + session_id + "; HttpOnly; Path=/; SameSite=Strict";
+			response.cookies.push_back("session_id=" + session_id + "; HttpOnly; Path=/; SameSite=Strict");
 		}
 
 		void send_response(int client_fd, const Response& response, string_view version) {