将OkHttp自定义拦截器添加到Feign客户端

我在OkHttp为我的@FeignClientbean 设置全局拦截器时遇到问题。我没有遇到任何错误，但是拦截器被忽略了。

我的理解是Spring Cloud的自动配置应该选择OkHttpClient.Builder我声明的bean并使用它来创建基础OkHttpClient实例，但是我对此可能是错误的。

这是我的Spring应用程序的相关部分：

@SpringBootApplication
@EnableFeignClients(defaultConfiguration = FeignConfig.class)    
@EnableCircuitBreaker
public class MyApp {

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

@Configuration
public class FeignConfig {

    @Bean
    public MyInterceptor myInterceptor() {
        return new MyInterceptor();
    }

    @Bean
    public OkHttpClient.Builder okHttpClientBuilder(MyInterceptor interceptor) {
        return new OkHttpClient.Builder().addInterceptor(interceptor);
    }
}

public class MyInterceptor implements okhttp3.Interceptor {

    @Override
    public Response intercept(Chain chain) throws IOException {

        Request request = chain.request();

        System.out.println("Hey there, this is my request: " + request);

        Response response = chain.proceed(request);

        System.out.println("Hey there, this is my response: " + response);

        return response;
    }

}

在intercept上述方法永远不会被调用。我需要MyInterceptor成为一个Spring bean，因为我需要向它注入其他依赖项。

@FeignClient(name = "myClient", fallback = MyClientFallback.class)
public interface MyClient {

    // method declarations
}

@Component
public class MyClientFallback implements MyClient {

    // method fallback implementations
}

这是我application.properties文件的相关部分：

feign.hystrix.enabled = true
feign.okhttp.enabled = true

ribbon.eureka.enabled = false
ribbon.eager-load.enabled = true
ribbon.eager-load.clients = myClient

myClient.ribbon.listOfServers = <IP_LIST>
myClient.ribbon.ServerListRefreshInterval = 10000

从上面声明的属性中可以看到，我没有使用Eureka，而是使用Ribbon来平衡其余客户端的负载。我还使用Hystrix启用后备响应，并将feign.okhttp.enabled属性设置为true。

以下是有关dependecies配置和版本的信息...

Spring Boot版本为2.0.3.RELEASE，Spring Cloud版本为Finchley.SR1，而OkHttp版本为3.11.0。

在我的pom.xml文件中，我有以下spring-cloud-dependencies配置：

<dependencyManagement>
    <dependencies>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Finchley.SR1</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>

        ...

    </dependencies>
</dependencyManagement>

我还包括了以下Spring Boot和Spring Cloud依赖关系以及OkHttp依赖关系：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.3.RELEASE</version>
</parent>

<dependencies>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
    </dependency>

    <dependency>
        <groupId>com.squareup.okhttp3</groupId>
        <artifactId>okhttp</artifactId>
        <version>3.11.0</version>
    </dependency>

    ...

</dependencies>