public class Main {
     public static void main(String[] args) throws Exception {
         List<HarHeader> headers = new ArrayList<>();
         List<HarQueryString> queryStrings = new ArrayList<>();
 
         User user = new User();
         Faker faker = new Faker();
         user.setFirstName(faker.name().firstName());
         user.setLastName(faker.name().lastName());
 
 
         HarPostData harPostData =
                 new HarPostDataBuilder()
                         .withMimeType(MediaType.APPLICATION_JSON)
                         .withText(ObjectUtils.writeValueAsString(user)).build();
 
         HarRequest harRequest =
                 new HarRequestBuilder()
                         .withMethod(HttpMethod.GET.toString())
                         .withUrl("http://localhost:5000/users")
                         .withHeaders(headers)
                         .withQueryString(queryStrings)
                         .withHttpVersion(HttpVersion.HTTP_1_1.toString())
                         .withPostData(harPostData)
                         .build();
 
         //Using default client
         HttpSnippet httpSnippet = new HttpSnippetCodeGenerator().snippet(harRequest, Language.JAVA);
         System.out.println(httpSnippet.getCode());
 
         //Or directly using
         String code   = new OkHttp().code(harRequest);
         System.out.println(code);
 
     }
 
     @Data
     static class User {
         private String firstName;
         private String lastName;
     }
 }

HttpResponse<String> response = Unirest.get("http://localhost:5000/users")
  .body("{\"firstName\":\"Burton\",\"lastName\":\"Greenholt\"}")
  .asString();