http proxy credentials

proxycreds.groovy

@Grab(group='org.apache.httpcomponents', module='httpclient', version='4.5.2')

import org.apache.http.*
import org.apache.http.auth.*
import org.apache.http.client.*
import org.apache.http.client.config.*
import org.apache.http.client.methods.*
import org.apache.http.impl.auth.*
import org.apache.http.impl.client.*
import org.apache.http.util.*
import org.apache.http.client.protocol.*

def credsProvider = new BasicCredentialsProvider();
def proxy = new HttpHost('localhost', 8888)
def target = new HttpHost('localhost', 8081)

AuthCache authCache = new BasicAuthCache()
authCache.put(proxy, new BasicScheme(ChallengeState.PROXY))
credsProvider.setCredentials(new AuthScope(proxy), new UsernamePasswordCredentials('test', 'test'))

HttpClientContext context = HttpClientContext.create()
context.setCredentialsProvider(credsProvider)
context.setAuthCache(authCache)

CloseableHttpClient httpclient = HttpClients.custom()
    .setDefaultCredentialsProvider(credsProvider)
    .build();

RequestConfig config = RequestConfig.custom()
    .setProxy(proxy)
    .build();
HttpGet httpget = new HttpGet('/');
httpget.setConfig(config);

CloseableHttpResponse response = httpclient.execute(target, httpget, context);
println(response.getStatusLine());
//println(EntityUtils.toString(response.getEntity()));