How to set headers to RestTemplate
- RestTemplate we need to use exchange() for a service call.
- exchange() will accepts url, method, requestEntity, responseType as arguments.
java restTemplate.exchange(url, method, requestEntity, responseType)
- method is HttpMethod with GET, POST ...
- requestEntity is for body and headers of service request.
- HttpEntity will be used as requestEntity.
- set headers to HttpEntity.
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<String> entity = new HttpEntity<>(headers);
Service
package com.example.demo;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
@Service
public class UserService {
private final RestTemplate restTemplate;
public UserService(RestTemplateBuilder restTemplateBuilder) {
this.restTemplate = restTemplateBuilder.build();
List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
converter.setSupportedMediaTypes(Collections.singletonList(MediaType.ALL));
messageConverters.add(converter);
this.restTemplate.setMessageConverters(messageConverters);
}
public Object getUser(int userId) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<String> entity = new HttpEntity<>(headers);
return this.restTemplate.exchange("https://jsonplaceholder.typicode.com/todos/" + userId, HttpMethod.GET,
entity, Object.class);
}
}