Spring HTTP Client ErrorLoggingInterceptor

README.md

HTTP Client interceptor that logs the target URI, HTTP status, response body and request body, to aid debugging.

ErrorLoggingInterceptor.java

@Component
@Slf4j
public class ErrorLoggingInterceptor implements ClientHttpRequestInterceptor {
  @Nonnull
  @Override
  public ClientHttpResponse intercept(@Nonnull HttpRequest request, @Nonnull byte[] body, ClientHttpRequestExecution execution)
      throws IOException {
    var response = execution.execute(request, body);
    
    var statusCode = response.getStatusCode();
    if (!statusCode.is2xxSuccessful()) {
      var targetUri = request.getURI();
      var responseBody = IOUtils.toString(response.getBody(), StandardCharsets.UTF_8);
      var requestBody = new String(body, StandardCharsets.UTF_8);
      
      log.error("HTTP request error:"
                + "\n\tTarget URI: {}"
                + "\n\tHTTP Status: {} ({})"
                + "\n\tResponse Body: {}"
                + "\n\tRequest Body: {}",
            targetUri, statusCode.value(), statusCode.getReasonPhrase(), responseBody, requestBody);
    }
    
    return response;
  }
}