Feign common headers using RequestInterceptor

Carvia Tech | December 07, 2019 | 1 min read | 98 views

We will inject common headers to all requests in Feign using RequestInterceptor in Spring Boot application.

Gradle dependencies

We need to add OpenFeign dependency in our gradle project.

dependencies {
    implementation "org.springframework.boot:spring-boot-starter-web"
    implementation "org.springframework.cloud:spring-cloud-starter-openfeign"

RequestInterceptor Bean

Feign provides RequestInterceptor interface that can be used for adding/removing/mutating any part of the request.

public interface RequestInterceptor {

    * Called for every request. Add data using methods on the supplied RequestTemplate.
    void apply(RequestTemplate template);

All we need to do is to create a Bean of type RequestInterceptor inside a config class and provide that configuration to FeignClient.

import feign.RequestInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;

public class FeignConfig {

    public RequestInterceptor requestInterceptor() {
        return requestTemplate -> {
            requestTemplate.header("Content-Type", "application/json");
            requestTemplate.header("Accept", "application/json");
            requestTemplate.header("header_1", "value_1");
            requestTemplate.header("header_2", "value_2");
            requestTemplate.header("header_3", "value_3");

This will create a RequestInterceptor that will inject 5 headers to each request.

Now we will create a FeignClient using the above configuration:

Creating a Feign Client for stores-service
@FeignClient(value = "stores", configuration = {FeignConfig.class}) (1)
public interface StoreClient {

    @RequestMapping(method = RequestMethod.GET, value = "/stores")
    List<Store> getStores();
1 We have specified FeignConfig using configuration attribute of FeignClient annotation.

Running the application

Main application
@EnableFeignClients (1)
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);

1 Enabling the Feign Clients

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