Пример будет таким, как показано ниже,
final String enhancementPayload ="sunil kumar";
HttpPost submitFormReq = new HttpPost("https://bgl-ast/rest/service/form/form-data");
StringEntity enhancementJson = new StringEntity(enhancementPayload);
submitFormReq.setEntity(enhancementJson);
submitFormReq.setHeader("Content-Type", "application/xml");
HttpResponse response = httpClient.execute( submitFormReq );
String result = EntityUtils.toString(response.getEntity());
System.out.println("result "+result);
assertEquals(200, response.getStatusLine().getStatusCode());