Chain REST requests using restbed C++ - c++

Question

I am trying to chain some REST requests using restbed lib and I have an issue.
So the work flow is something like this: the frontend sends a GET request to the backend. The backend does some processing and should return a reponse to the frontend but in the same time it should also POST the resposnse to another REST server.
void CCMService::get_method_handler(const shared_ptr< Session > session)
{
const auto request = session->get_request();
int content_length = request->get_header("Content-Length", 0);
session->fetch(content_length, [](const shared_ptr< Session > session, const Bytes & body)
{
std::vector<std::string> resultImages;
fprintf(stdout, "%.*s\n", (int)body.size(), body.data());
const auto request = session->get_request();
const string parameter = request->get_path_parameter("camGroupId");
try
{
resultImages = prepareImages(parameter.c_str());
}
catch (const std::exception& e)
{
std::string error = e.what();
std::string message = "{error: \"" + error + "\"}";
throw std::exception(message.c_str());
}
fprintf(stderr, "Return response\n");
session->close(OK, resultImages[0], { { "Content-Length", std::to_string(resultImages[0].length())} });
fprintf(stderr, "Send tiles to inference\n");
//send POST request
sendResult(resultImages[1]);
});
}
void CCMService::sendResult(char* result)
{
auto request = make_shared< Request >(Uri("http://127.0.0.1:8080/api"));
request->set_header("Accept", "*/*");
request->set_header("Content-Type", "application/json");
request->set_method("POST");
request->set_header("Host", "http://127.0.0.1:8080");
//request->set_header("Cache-Control", "no-cache");
...
//create json from result - jsonContent
...
request->set_header("Content-Length", std::to_string(jsonContent.length()));
request->set_body(jsonContent);
auto settings = make_shared< Settings >();
auto response = Http::sync(request, settings);
print(response)
}
What happens is that when I do the POST request from sendResult function it immediately gets a error response and does not wait for the real response.
What am I doing wrong?
Thanks.