From 3214f860846f5babc4e2bbbaa115484e525a72ac Mon Sep 17 00:00:00 2001
From: alex <balaschalexander@gmail.com>
Date: Mon, 4 May 2026 21:59:31 +0200
Subject: [PATCH] fix: prevent segfault on OPTIONS preflight requests

Using http::empty_body with prepare_payload() causes Boost.Beast to
use chunked transfer encoding for keep-alive connections, but the
empty_body serializer cannot produce valid chunked buffers. Switch to
http::string_body with an empty body, which correctly sets
Content-Length: 0 instead.

Tested on: Linux 7.0.0-14-generic (Ubuntu), AMD Ryzen AI 9 HX 370 w/ Radeon 890M

Closes #379
---
 src/server/server.cpp | 3 ++-
 src/server/server.hpp | 1 -
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/server/server.cpp b/src/server/server.cpp
index 85ac84f8..f1ab4c63 100644
--- a/src/server/server.cpp
+++ b/src/server/server.cpp
@@ -254,7 +254,8 @@ void HttpSession::handle_request(bool cors) {
         header_print("✈️ ", "Handling Preflight (OPTIONS) request");
 
         // reponse empty body for OPTIONS
-        auto options_res = std::make_shared<http::response<http::empty_body>>();
+        auto options_res = std::make_shared<http::response<http::string_body>>();
+        options_res->body() = "";
         options_res->version(req_.version());
         options_res->result(http::status::ok); 
         options_res->keep_alive(req_.keep_alive());
diff --git a/src/server/server.hpp b/src/server/server.hpp
index b64a7aa6..94a69905 100644
--- a/src/server/server.hpp
+++ b/src/server/server.hpp
@@ -11,7 +11,6 @@
 #include <boost/beast/core.hpp>
 #include <boost/beast/http.hpp>
 #include <boost/beast/version.hpp>
-#include <boost/beast/http/empty_body.hpp>
 #include <boost/asio.hpp>
 #include <nlohmann/json.hpp>
 #include <string>