System.err: java.net.UnknownHostException: Unable to resolve host "proxy01"

Question

I am getting this error

System.err: java.net.UnknownHostException: Unable to resolve host "proxy01": No address associated with hostname

I am using OKHTTP. My company have two internet connections. One which requires authentication. When l make OKHTTP call using the guest network, it works as expected. But when l switch network and connect to the secured network, l get the error above. I know my company have proxy server which am suspecting is preventing outgoing network call without authentication. When l connect to the secure network and authenticate with my username and password, am able to open google.com on my phone, however, when l open my app on the phone l get the above error

maybe use the fully qualified domain name of proxy01. The hostname needs to be resolvable on the machine that the application runs. — Guenther
– Guenther, Commented Aug 23, 2016 at 9:16

Sanjeev · Accepted Answer · 2016-08-23 09:38:52Z

1

You need to provide proxy settings and its authenticator while working with OKHTTP, Something like this :

Authenticator proxyAuthenticator = new Authenticator() {
  @Override public Request authenticate(Route route, Response response) throws IOException {
       String credential = Credentials.basic(<username>, <password>);
       return response.request().newBuilder()
           .header("Proxy-Authorization", credential)
           .build();
  }
};

OkHttpClient client = new OkHttpClient.Builder()
    .proxy(new Proxy(Proxy.Type.HTTP, new InetSocketAddress(<proxyHost>, <proxyPort>)))
    .proxyAuthenticator(proxyAuthenticator)
    .build();

replace tokens <token> with their respective values.

answered Aug 23, 2016 at 9:38

Sanjeev

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1 Comment

Ernest Appiah Over a year ago

How come apps l open using my phone works without requiring username and password for the proxy server. Example, whatsapp? Once l authenticate the network, it works flawlessly

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