Disable automatic redirect handling in HTTPBuilder

gistfile1.groovy

// Return the actual location of a web page given a shortened url.

// Based in part on this Stack Overflow answer:
// http://stackoverflow.com/questions/1519392/how-to-prevent-apache-http-client-from-following-a-redirect

import groovyx.net.http.HTTPBuilder
import org.apache.http.impl.client.AbstractHttpClient
import org.apache.http.params.BasicHttpParams
import static groovyx.net.http.Method.HEAD

HTTPBuilder http = new HTTPBuilder(url)
AbstractHttpClient ahc = http.client
BasicHttpParams params = new BasicHttpParams();
params.setParameter("http.protocol.handle-redirects",false)
ahc.setParams(params)

http.request(HEAD) {
    response.success = { rsp ->
        println rsp.headers?.Location
    }
}