Prevent OkHttp/Retrofit from bypassing proxy

Question

When OkHttp tries a proxy, and that route fails once, every request after that request will completely bypass the Android system proxy. So it is difficult to debug using Charles.

I currently have the code below, but it is setup to only be for Debug builds. It works great, but it's a hack, and we're looking to release this for all users.

Is there some hidden OkHttpClient.dontBypassProxy setting that I can't find? Or, does the code below look like a good solution?

    OkHttpClient.Builder baseClientBuilder = new OkHttpClient.Builder().retryOnConnectionFailure(false).connectionPool(new ConnectionPool(5, 20, TimeUnit.SECONDS));

    //Ask OkHttp what proxies we have setup
    List<Proxy> proxies = ProxySelector.getDefault().select(URI.create("http://www.somesite.com"));

    if (proxies.size() > 0 && proxies.get(0) != Proxy.NO_PROXY) {
        //Force OkHttp to always use this proxy
        baseClientBuilder.proxy(proxies.get(0));
    }

Answer 1

This was fixed in OkHttp 3.5.0

https://square.github.io/okhttp/changelog_3x/

OkHttp no longer attempts a direct connection if the system’s HTTP proxy fails. This behavior was surprising because OkHttp was disregarding the user’s specified configuration. If you need to customize proxy fallback behavior, implement your own java.net.ProxySelector.