feat: server/main.cpp: add sp API to example.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

Author: amlel-el-mahrouss

example/server/main.cpp

@@ -87,6 +87,13 @@ int server_main( int argc, char* argv[] )
         options.set(http_proto::x_download_options(http_proto::helmet_download_type::noopen));
         options.set(http_proto::x_frame_origin(http_proto::helmet_origin_type::deny));
 
+        std::vector<std::string> allow_list;
+
+        http_proto::sp::append(allow_list, "script-src", http_proto::sp::allow_type::self);
+        http_proto::sp::append(allow_list, "object-src", http_proto::sp::allow_type::none);
+
+        options.set(http_proto::content_security_policy(allow_list));
+
         srv.wwwroot.use(
             http_proto::helmet(options), 
             [] ( http_proto::route_params& ) ->