Feign Forward Header Interceptor

ForwardHeadersFeignInterceptor

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Primary;
import org.springframework.http.HttpHeaders;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Objects;

@Component
public class ForwardHeadersFeignInterceptor implements RequestInterceptor {

	@Override
	public void apply(RequestTemplate requestTemplate) {
		RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
		if (Objects.nonNull(requestAttributes) && requestAttributes instanceof ServletRequestAttributes) {
			HttpServletRequest servletRequest = ((ServletRequestAttributes) Objects.requireNonNull(requestAttributes))
					.getRequest();
			requestTemplate.header(HttpHeaders.AUTHORIZATION, servletRequest.getHeader(HttpHeaders.AUTHORIZATION));
		}
		requestTemplate.removeHeader(HttpHeaders.CONTENT_LENGTH);
	}

}