com.android.volley.NoConnectionError - Android emulator with Charles Proxy

Question

I want to proxy network traffic for an Android emulator.

I can't seem to get it to work.

My emulator is booted up using this:

emulator @Nexus_5X_API_23 -http-proxy 10.0.1.17:8888

The IP and port points to what Charles reports in the Help menu.

The SSL certificate is installed. I can open the emulator browser and Charles shows me all traffic. The browser updates as usual.

All seems good so far.

Now I attempt to run my app. My first network call goes out successfully through Charles. The response returns and Charles displays it. However the response isn't passed to the app successfully.

I've set a breakpoint in the error callback and I can see a com.android.volley.NoConnectionError which is caused by java.io.IOException: unexpected end of stream on Connection.

Why doesn't Charles pass the result back back properly to the app?

Do I need to do what's defined at the end of the configuration page on Charles?

HttpHost httpproxy = new HttpHost("192.168.0.101", 8888, "http");
httpClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,httpproxy);

This doesn't seem correct - what am I missing?

Answer 1

In order to help solving

java.io.IOException: unexpected end of stream on Connection

issue please answer the questions in the comments.

As regards to

HttpHost httpproxy = new HttpHost("192.168.0.101", 8888, "http"); httpClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,httpproxy);

it will not help you just like that. In fact this is another way to apply a proxy which IMO is even better than '-http-proxy' because you can apply it anywhere not only for an emulator and it is only for this app build.

You need to apply the proxy in the Http Stack you use. for example:

public class ProxyHurlStack extends HurlStack {

    @Override
    protected HttpURLConnection createConnection(URL url) throws IOException {
        Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("10.0.1.17", 8888));
        HttpURLConnection conn = (HttpURLConnection) url.openConnection(proxy);
        return conn;
    }
}

and then for you debug build you can use smth like:

requestQueue = Volley.newRequestQueue(context, new ProxyHurlStack());