public static void get(
    String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);

public static void post(
    String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    HttpEntity body, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);

public static void post(
    String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    String body, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);

public static void put(String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    HttpEntity body, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);
    
public static void put(
    String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    String body, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);

public static void patch(
    String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    HttpEntity body, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);
    
public static void patch(
    String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    String body, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);

public static void delete(
    String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);

// When a request body is needed
public static void delete(
    String uristr, 
    Map<String, String> headers, 
    Map<String, Object> params, 
    String body, 
    Map<String, Object> options,
    Consumer<? super HttpResponse> action);

public static String responseToString(
    HttpResponse response) throws ParseException, IOException;
  

public static String responseToString(
    HttpResponse response, 
    String charset) throws ParseException, IOException;

You must register external sites in the Remote Sites Whitelist setting before HTTP methods are called. This setting defines which external web sites can be accessed by Max applications. Format values in property-object format, with one key-value pair separated by a colon on each line, with the remote site URL as the value, for example: site1:https://www.site1.com site2:https://www.site2.com Otherwise, calls to this API fail.

import com.servicemax.core.utils.HttpRequestHelper
// this site must be registered in Remote Sites Whitelist setting beforehand
def uri = 'https://www.domain.com'
def result = ""
HttpRequestHelper.get(uri, null, null, [:], {response -> 
  result = HttpRequestHelper.responseToString(response, 'UTF-8')
});

result