RestTemplate with overriden dns to localhost

RestTemplateWithDnsOverrideConfig.groovy

package example;

import org.apache.http.HttpRequest
import org.apache.http.HttpResponse
import org.apache.http.ProtocolException
import org.apache.http.client.RedirectStrategy
import org.apache.http.client.methods.HttpUriRequest
import org.apache.http.conn.DnsResolver
import org.apache.http.impl.client.HttpClientBuilder
import org.apache.http.protocol.HttpContext
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory
import org.springframework.web.client.RestTemplate

@Configuration
class RestTemplateWithDnsOverrideConfig {
    @Bean
    RestTemplate createRestTemplate() {
        return new RestTemplate(
                new HttpComponentsClientHttpRequestFactory(
                        HttpClientBuilder.create()
                                .setDnsResolver(createDnsResolver())
                                .build()
                )
        )
    }

    private DnsResolver createDnsResolver() {
        return new DnsResolver() {
            @Override
            InetAddress[] resolve(String host) throws UnknownHostException {
                return [Inet4Address.getByAddress([127, 0, 0, 1] as byte[])]
            }
        }
    }
}

RestTemplateWithoutRedirectConfig.groovy

package example;

import org.apache.http.HttpRequest
import org.apache.http.HttpResponse
import org.apache.http.ProtocolException
import org.apache.http.client.RedirectStrategy
import org.apache.http.client.methods.HttpUriRequest
import org.apache.http.conn.DnsResolver
import org.apache.http.impl.client.HttpClientBuilder
import org.apache.http.protocol.HttpContext
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory
import org.springframework.web.client.RestTemplate

@Configuration
class RestTemplateWithDnsOverrideConfig {
    @Bean
    RestTemplate createRestTemplate() {
        return new RestTemplate(
                new HttpComponentsClientHttpRequestFactory(
                        HttpClientBuilder.create()
                                .setRedirectStrategy(createRedirectStrategy())
                                .build()
                )
        )
    }

    private RedirectStrategy createRedirectStrategy() {
        return new RedirectStrategy() {
            @Override
            boolean isRedirected(HttpRequest request, HttpResponse response, HttpContext context) throws ProtocolException {
                return false
            }

            @Override
            HttpUriRequest getRedirect(HttpRequest request, HttpResponse response, HttpContext context) throws ProtocolException {
                return null
            }
        }
    }
}