Basic Post Request isn't working

[ughstudios]

void RegisterUser(std::string username, std::string password)
{
	RestClient::init();
	std::unique_ptr<RestClient::Connection> conn = std::make_unique<RestClient::Connection>(GetRegistrationURL());
	conn->SetBasicAuth(username, password);
	conn->SetTimeout(5);
	conn->SetUserAgent("game");
	conn->AppendHeader("Content-Type", "application/json");
	nlohmann::json json_data;
	json_data["username"] = username;
	json_data["password"] = password;
	RestClient::Response resp = conn->post("", json_data.dump());
	RestClient::disable();
}

Why does this not send any http request? It compiles and runs without any errors or exceptions.