[GitHub] [apisix-java-plugin-runner] beginnerWJC commented on issue #189: bug: 使用apisix的ext-plugin-post-resp插件配合apisix-java-plugin-runner0.3.0支持过滤上游响应标头时，上游返回状态码为204时，会重复发送http的请求的问题

Tue, 23 Aug 2022 04:49:40 -0700 


beginnerWJC commented on issue #189:
URL: 
https://github.com/apache/apisix-java-plugin-runner/issues/189#issuecomment-1223955976

   我的测试postFilter代码
   package org.apache.apisix.plugin.runner.filter;
   
   import java.util.Map;
   import org.apache.apisix.plugin.runner.PostRequest;
   import org.apache.apisix.plugin.runner.PostResponse;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   import org.springframework.stereotype.Component;
   import com.alibaba.fastjson.JSON;
   
   @Component
   public class TestPostFilter implements PluginFilter {
        
        private final Logger logger = 
LoggerFactory.getLogger(TestPostFilter.class);
   
        @Override
        public String name() {
                return "TestPostFilter";
        }
        
        @Override
        public void postFilter(PostRequest request, PostResponse response, 
PluginFilterChain chain) {
                logger.info("TestPostFilter插件开始执行！");
                Map<String, String> headersMap = request.getUpstreamHeaders();
                logger.info("上游返回的headers:{}",JSON.toJSONString(headersMap));
                int statusCode = request.getUpstreamStatusCode();
                logger.info("上游返回的状态码为:{}",statusCode);
                response.setHeader("apisix", "TestPostFilter");
                chain.postFilter(request, response);
       }
   
   }
   通过apisix dashboard配置路由一个http返回值是204并且没有返回体的接口
   
![image](https://user-images.githubusercontent.com/37164104/186148512-5b210de5-d6f0-47c1-b994-762befb9455e.png)
   然后测试调用，发现上游的接口返回204时会请求两次
   由于我测试代理的是登出接口，第一次是204，第二次由于已经登出过了就变成401了，导致我发现了这个问题。
   
![image](https://user-images.githubusercontent.com/37164104/186115166-71c2212c-2410-4510-8403-5a8c99807fc9.png)
   
![image](https://user-images.githubusercontent.com/37164104/186115262-0a045b1c-0444-4e33-9135-63d88fdf97fe.png)
   
![image](https://user-images.githubusercontent.com/37164104/186115387-4fea4111-18c1-4a75-9de7-6692c3fb0e0f.png)
   然后在本地把登出接口http返回码改成200就正常了，只请求了一次
   
![image](https://user-images.githubusercontent.com/37164104/186119148-114235fb-910e-455d-a606-50027bbb0db4.png)
   
![image](https://user-images.githubusercontent.com/37164104/186119422-5a08f8c9-ac8a-4cc1-942b-947d0909f395.png)
   
   这个是我完整的复现过程了


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