Issue
I defined a Configuration class like this:
@Configuration
public class RestTemplateConfiguration {
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
The bean above is used by different services to perform actions like these:
ResponseEntity<Cars> cars= restTemplate.exchange(
RequestEntity.get(new URI(url)).headers(headers).build(),
Cars.class);
or
ResponseEntity<CarDetail> savingAmountConsumed = restTemplate.exchange(
builder.buildAndExpand(uriVariable).toUri(),
HttpMethod.PUT,
requestEntity,
CarDetail.class);
For each service, I'm defining different URI variable uriVariable and always defining the same header configuration like this:
HttpHeaders headers = new HttpHeaders();
headers.setBearerAuth(token);
headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
Is it possible to reconfigure the RestTemplate in a way that I don't need to set the same header in different services multiple times? (same question applies to the URI)
Solution
In order to set the Accept header you can use an Interceptor as follows:
public class AcceptHeaderSetterInterceptor implements ClientHttpRequestInterceptor {
@Override
public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
HttpHeaders headers = request.getHeaders();
headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
return execution.execute(request, body);
}
}
Then you need to register this Interceptor:
@Configuration
public class Config {
@Bean
public RestTemplate restTemplate() {
RestTemplate restTemplate = new RestTemplate(clientHttpRequestFactory());
restTemplate.setInterceptors(Collections.singletonList(new AcceptHeaderSetterInterceptor()));
return restTemplate;
}
}
Regarding the URI I wouldn't suggest you do that because it is pretty common to use the same RestTemplate to call different URLs. The same goes for the Bearer Token because I guess it really depends on the URL you are calling.
Answered By - João Dias
