Custom Middleware does not run on POST request, only on GET request.

[Rz-Rz]

I am using Crow 1.2.

I have created the following middleware :

struct DynamicCORS {
  struct context {};

  void before_handle(crow::request &req, crow::response &res, context &ctx) {
    // Find the Origin header
    auto origin_iter = req.headers.find("Origin");
    if (origin_iter != req.headers.end()) {
      std::cout << "Origin: " << origin_iter->second << std::endl;
    } else {
      std::cout << "Origin: Not found" << std::endl;
    }

    // Print the HTTP method
    std::cout << "Method: " << crow::method_name(req.method) << std::endl;

    // Print all headers
    std::cout << "Headers:" << std::endl;
    for (const auto &header : req.headers) {
      std::cout << "  " << header.first << ": " << header.second << std::endl;
    }
    // Handle preflight (OPTIONS) requests
    if (req.method == crow::HTTPMethod::Options) {
      auto origin_iter = req.headers.find("Origin");
      if (origin_iter != req.headers.end()) {
        std::string origin = origin_iter->second;
        res.add_header("Access-Control-Allow-Origin", origin);
        res.add_header("Access-Control-Allow-Credentials", "true");
        res.add_header("Access-Control-Allow-Methods",
                       "GET, POST, PUT, DELETE, OPTIONS");
        res.add_header("Access-Control-Allow-Headers",
                       "Content-Type, Authorization, X-Requested-With");
        res.code = 204; // No Content
        res.end();
      }
    }
  }

  void after_handle(crow::request &req, crow::response &res, context &ctx) {
    auto origin_iter = req.headers.find("Origin");
    if (origin_iter != req.headers.end()) {
      std::string origin = origin_iter->second;
      res.add_header("Access-Control-Allow-Origin", origin);
      res.add_header("Access-Control-Allow-Credentials", "true");
    }
  }
};

It is designed to reflect the host origin, similar to setting '*' but it works with the browser.
I am setting the app with this custom Middleware like this :

  crow::App<DynamicCORS> app;

For get request I have no problem and I also get the logs from my app.
Here's the response headers :

HTTP/1.1 200 OK
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: http://0.0.0.0:8000
Content-Type: application/json
Content-Length: 67
Server: Crow/master
Date: Wed, 04 Dec 2024 11:57:51 GMT
Connection: Keep-Alive

However for POST requests I get this :

HTTP/1.1 204 No Content
Allow: OPTIONS, HEAD, DELETE, GET, POST
Content-Length: 0
Server: Crow/master
Date: Wed, 04 Dec 2024 11:57:54 GMT

And I don't get any logs from my app, so the middleware was actually not triggered. Here's how I register my routes :

  CROW_ROUTE(app, "/example/<string>")
      .methods(crow::HTTPMethod::Post, crow::HTTPMethod::Get)(get_example);

[gittiver]

There is no option request before POST?