HTTP Proxy doesn't work with SSL on Linux

[ChristophAlbert]

I have a very simple test program:

#include <iostream>
#include "cpprest/http_client.h"
using namespace std;
using namespace web::http;
using namespace web::http::client;

int main()
{
  web::web_proxy proxy("https://www-myproxy:8080");
  credentials proxyCredentials("user","Password");
  proxy.set_credentials(proxyCredentials);

  http_client_config config;
  config.set_proxy(proxy);
  http_client client("https://www.google.de", config);
  auto response = client.request(methods::GET).get();
  cout << response.status_code() << endl;
  std::cout << response.extract_string(true).get() << std::endl;
}

Even after applying PR527, it doesn't work on Linux but results in an http_exception with error message "Error in SSL handshake".
However, it runs fine on Windows (with wstrings). It also runs fine on Linux when I retrieve http://www.google.de instead of https://www.google.de.

Any idea what could be the issue here?

[ChristophAlbert]

I close the issue - I strongly suspect now that it is actually an issue with the way network access is handled in my VM.