Optionally skip copying into connection arena for appendMessage

src/connection.cpp

@@ -27,10 +27,14 @@ Connection::~Connection() {
   }
 }
 
-void Connection::appendMessage(std::string_view s) {
+void Connection::appendMessage(std::string_view s, bool copyToArena) {
+  if (copyToArena) {
     char *arena_str = arena_.allocate<char>(s.size());
     std::memcpy(arena_str, s.data(), s.size());
     messages_.emplace_back(arena_str, s.size());
+  } else {
+    messages_.push_back(s);
+  }
 }
 
 std::string_view Connection::readBytes(size_t /*max_request_size*/,

src/connection.hpp

@@ -40,7 +40,7 @@ struct Connection {
   ~Connection();
 
   // Handler interface - public methods that handlers can use
-  void appendMessage(std::string_view s);
+  void appendMessage(std::string_view s, bool copyToArena = true);
   void closeAfterSend() { closeConnection_ = true; }
   ArenaAllocator &getArena() { return arena_; }
   int64_t getId() const { return id_; }