Spring Cloud 疑难杂症(4): Feign 访问缓慢及调用出错
使用Feign调用其他微服务的方法时，有时会出现缓慢的情况。经过排查发现并不是被调用方法自身缓慢造成的，极有可能是在fegin连接其他微服务这一个过程花费较长时间。
可以进行如下优化
使用OkHttp3
替换掉原生HttpClient
引入新依赖
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| <dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-okhttp</artifactId>
</dependency>
|
配置文
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| feign:
httpclient:
enabled: false
okhttp:
enabled: true
hystrix:
enabled: true
client:
config:
default:
connectTimeout: 10000
readTimeout: 10000
|
注意 目前没有证据证明访问速度因为这个配置变快(2020-04-03)
Okhttp 参数配置
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| @AutoConfigureBefore(FeignAutoConfiguration.class)
@Configuration
@ConditionalOnClass(Feign.class)
public class FeginOkHttpConfig {
private int feiginOkHttpReadTimeout = 60;
private int feignConnectTimeout = 60;
private int feignWriteTimeout = 120;
@Bean
public okhttp3.OkHttpClient okHttpClient() {
return new okhttp3.OkHttpClient.Builder()
.readTimeout(feiginOkHttpReadTimeout, TimeUnit.SECONDS)
.connectTimeout(feignConnectTimeout, TimeUnit.SECONDS)
.writeTimeout(feignWriteTimeout, TimeUnit.SECONDS)
.connectionPool(new ConnectionPool(10, 5L, TimeUnit.MINUTES))
.build();
}
}
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Feign提前加载
feign是在使用时才进行加载，所以第一次访问时会有连接上的耗时，改成在程序启动时就进行加载可以加快连接速度
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|
ribbon:
eureka:
enabled: true
ReadTimeout: 10000
ConnectTimeout: 10000
eager-load:
enabled: true
clients: deco-common-service
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用户请求 content-length 覆盖到 微服务调用方法
Invalid character found in method name. HTTP method names must be tokens
遇到这里保存解决方法是情况外部请求头部中的 “content-type”, “content-length” 两个字段
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| @Slf4j
public class FeignConfiguration implements RequestInterceptor {
@Value("${rendering.token}")
private String token;
private static final String X_CLIENT_TOKEN_USER = "x-service-token";
@Override
public void apply(RequestTemplate template) {
List<String> headNameList = Arrays.asList("content-type", "content-length");
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
Enumeration<String> headerNames = request.getHeaderNames();
template.header(X_CLIENT_TOKEN_USER, token);
if (headerNames != null) {
while (headerNames.hasMoreElements()) {
String name = headerNames.nextElement();
String values = request.getHeader(name);
if (!headNameList.contains(name)) {
template.header(name, values);
}
}
log.debug("feign interceptor header:{}",template);
}
}
@Bean
public feign.Logger.Level feignLoggerLevel(){
return feign.Logger.Level.FULL;
}
}
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