Question

我使用spring cloud来构建多个微服务，我使用一个使用Spring Cloud Netfix的Zuul Server实现的API网关将请求路由到我们的微服务，网关配置如下：

application.yml：

server:
port: 8021

ribbon:
ConnectTimeout: 3000
ReadTimeout: 60000

zuul:
ignoredServices: "*"
add-proxy-headers: true
#prefix: /v1

routes:
m_test:
path: /api/testService/**
sensitiveHeaders: "*"
url: http://127.0.0.1:4008/testService/  

eureka:
instance:
hostname: gateway
client:
 registerWithEureka: true
 fetchRegistry: true
serviceUrl:
  defaultZone: http://127.0.0.1:8761/eureka/

CorsFilter.java：

@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
public class CorsFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

    HttpServletResponse response = (HttpServletResponse) res;
    HttpServletRequest request = (HttpServletRequest) req;
    response.setHeader("Access-Control-Allow-Origin", "*");
    response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization,Content-length");
    response.setHeader("Access-Control-Max-Age", "1800");
    Map<String, String> map = getHeadersInfo(request);

    if (request.getMethod().equalsIgnoreCase("OPTIONS")) {
        response.setStatus(HttpServletResponse.SC_OK);
    } else {
        chain.doFilter(request, response);
    }
}

public void init(FilterConfig filterConfig) {
}

public void destroy() {
}

private Map<String, String> getHeadersInfo(HttpServletRequest request) {
    Map<String, String> map = new HashMap<>();
    Enumeration headerNames = request.getHeaderNames();
    while (headerNames.hasMoreElements()) {
        String key = (String) headerNames.nextElement();
        String value = request.getHeader(key);
        map.put(key, value);
    }

    return map;
}
}

GatewaySystemApplication.java：

@SpringBootApplication
@EnableZuulProxy
@EnableEurekaClient
public class GatewaySystemApplication {

public static void main(String[] args) throws Exception {
    //SpringApplication.run(GatewaySystemApplication.class, args);
    new SpringApplicationBuilder(GatewaySystemApplication.class).web(true).run(args);
}
}

浏览器响应标头如下：

passing through gateway layer response headers

我的请求的响应标头错过了内容长度，但是当我直接调用后端服务时它有内容长度。directly response headers

Answer 1

嗯，你没有设置Content-Length。

（FWIW，您的内容类型也是假的）。

当我使用spring cloud构建我的微服务时，如何向响应头添加内容长度

1 个答案: