Using libhttpserver to build https server - c++

Question

I am trying to compile the below piece of code to run a basic https server and i am encountering an error which i am not able to resolve. The class hello_world_resource is responsible for the server startup and the return statement gives the response that the server should give when it is accessed.
the url for the server is defined by function 'register_resource'
the url for the github documentation of the library - https://github.com/etr/libhttpserver
I've tried downloading ssl and curl multiple times and searched the google too but i am still not able to find the cause for this problem.
abcd.key and xyz.crt are the self-signed certificates that i generated following this procedure online -
https://www.digitalocean.com/community/tutorials/how-to-create-a-self-signed-ssl-certificate-for-apache-in-ubuntu-16-04
#include <httpserver.hpp>
using namespace httpserver;
class hello_world_resource : public http_resource
{
public:
const std::shared_ptr<http_response> render(const http_request&)
{
return std::shared_ptr<http_response>(new
string_response("Hello, World!"));
}
};
int main()
{
webserver ws = create_webserver(8080)
.use_ssl()
.https_mem_key("/path/to/abcd.key")
.https_mem_cert("/path/to/xyz.crt");
hello_world_resource hwr;
ws.register_resource("/hello", &hwr);
ws.start(true);
return 0;
}
The error being thrown is :
terminate called after throwing an instance of 'std::invalid_argument'
what(): BD
A
(G BBJ
Aborted
the code should run and a server should be available at - https://localhost:8080/hello