春天如何在@feignclient配置中设置自定义最大连接池大小

Question

How to set custom max connection pool size in @feignclient configuration in spring ,

@FeignClient(name = "content-cms", configuration = ContentCmsServiceFeignConfig.class)
public interface FeignService {

@RequestMapping(value = "/test/", method = RequestMethod.GET)
String getSample(@RequestParam("token") String token, @RequestParam("cid") String cid,
        @RequestParam("ratio") String ratio, @RequestParam("s") String source);

}

Answer 1

You can configure the number of connections within the specific Client implementation used. Feign has out of the box support Apache Http , OkHttp and Ribbon . When using Spring Cloud Open Feign , the default client is based on what you have in your classpath.

Here is an example using Apache Http , you can configure your own CloseableHttpClient bean with the settings you want.

@Configuration
public class HttpClientConfiguration {
    @Bean
    public CloseableHttpClient httpClient() {
       return HttpClients.custom()
                  .maxConnectionsPerRoute(200)
                  .maxConnections(200)
                  .build()
    }
} 

If you are using Spring Boot, you can configure any of the feign.httpclient.* properties as well.

feign:
   httpclient:
       maxConnections: 200
       maxConnectionsPerRoute: 200

You can find more information in the Spring Cloud OpenFeign Documentation: Overriding Feign Defaults