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 <h1 id="javaresthttp-status-code">问题描述：如何自定义某个Java方法对应的REST接口里的HTTP Status Code？</h1>
 <p>** 解决方法：**</p>
 <p>对于正常的返回值，可以通过SwaggerAnnotation实现，例如：</p>
 <pre><code class="language-java">@ApiResponse(code = 300, response = String.class, message = &quot;&quot;)
 public int test(int x) {
   return 100;
 }
 </code></pre>
 <p>对于异常的返回值，可以通过抛出自定义的InvocationException实现，例如：、</p>
 <pre><code class="language-java">    public String testException(int code) {
         String strCode = String.valueOf(code);
         switch (code) {
             case 200:
                 return strCode;
             case 456:
                 throw new InvocationException(code, strCode, strCode + &quot; error&quot;);
             case 556:
                 throw new InvocationException(code, strCode, Arrays.asList(strCode + &quot; error&quot;));
             case 557:
                 throw new InvocationException(code, strCode, Arrays.asList(Arrays.asList(strCode + &quot; error&quot;)));
             default:
                 break;
         }

         return &quot;not expected&quot;;
     }
 </code></pre>
 <h1 id="_1">问题描述： 如何定制自己微服务的日志配置</h1>
 <p>** 解决方法：**<br />
 ServiceComb不绑定日志器，只是使用了slf4j，用户可以自由选择log4j/log4j2/logback等等。ServiceComb提供了一个log4j的扩展，在标准log4j的基础上，支持log4j的properties文件的增量配置。</p>
 <ul>
 <li>默认以规则："classpath*:config/log4j.properties"加载配置文件</li>
 <li>实际会搜索出classpath中所有的<code>config/log4j.properties和config/log4j.*.properties</code>, 从搜索出的文件中切出<code>\*</code>的部分，进行alpha排序，然后按顺序加载，最后合成的文件作为log4j的配置文件。</li>
 <li>如果要使用ServiceComb的log4j扩展，则需要调用Log4jUtils.init，否则完全按标准的日志器的规则使用。</li>
 </ul>
 <h1 id="transporttransport">问题描述： 当服务配置了多个transport的时候，在运行时是怎么选择使用哪个transport的？</h1>
 <p>** 解决方法：**</p>
 <ul>
 <li>
 <p>ServiceComb的consumer、transport、handler、producer之间是解耦的，各功能之间通过契约定义联合在一起工作的，即：<br />
   consumer使用透明rpc，还是springmvc开发与使用highway，还是RESTful在网络上传输没有关系与producer是使用透明rpc，还是jaxrs，或者是springmvc开发，也没有关系handler也不感知，业务开发方式以及传输方式</p>
 </li>
 <li>
 <p>consumer访问producer，在运行时的transport选择上，总规则为：<br />
   consumer的transport与producer的endpoint取交集，如果交集后，还有多个transport可选择，则轮流使用</p>
 </li>
 </ul>
 <p>分解开来，存在以下场景：</p>
 <ul>
 <li>当一个微服务producer同时开放了highway以及RESTful的endpoint</li>
 <li>consumer进程中只部署了highway transport jar，则只会访问producer的highway endpoint</li>
 <li>consumer进程中只部署了RESTful transport jar，则只会访问producer的RESTful endpoint</li>
 <li>consumer进程中，同时部署了highway和RESTful transport jar，则会轮流访问producer的highway、RESTful endpoint</li>
 </ul>
 <p>如果，此时consumer想固定使用某个transport访问producer，可以在consumer进程的microservice.yaml中配置，指定transport的名称:</p>
 <pre><code>servicecomb:
   references:
     transport:
       &lt;service_name&gt;: highway
 </code></pre>
 <ul>
 <li>
 <p>当一个微服务producer只开放了highway的endpoint</p>
 </li>
 <li>
 <p>consumer进程只部署了highway transport jar，则正常使用higway访问</p>
 </li>
 <li>consumer进程只部署了RESTful transport jar，则无法访问</li>
 <li>
 <p>consumer进程同时部署了highway和RESTful transport jar，则正常使用highway访问</p>
 </li>
 <li>
 <p>当一个微服务producer只开放了RESTful的endpoint</p>
 </li>
 <li>
 <p>consumer进程只部署了highway transport jar，则无法访问</p>
 </li>
 <li>consumer进程只部署了RESTful transport jar，则正常使用RESTful访问</li>
 <li>consumer进程同时部署了highway和RESTful transport jar，则正常使用RESTful访问</li>
 </ul>
 <h1 id="swagger-body">问题描述： swagger body参数类型定义错误，导致服务中心注册的内容没有类型信息</h1>
 <p><strong>现象描述:</strong></p>
 <p>定义如下接口，将参数放到body传递</p>
 <pre><code>/testInherate:
     post:
       operationId: &quot;testInherate&quot;
       parameters:
       - in: &quot;body&quot;
         name: &quot;xxxxx&quot;
         required: false
         type: string
       responses:
         200:
           description: &quot;response of 200&quot;
           schema:
             $ref: &quot;#/definitions/ReponseImpl&quot;
 </code></pre>
 <p>采用上面方式定义接口。在服务注册以后，从服务中心查询下来的接口type: string 丢失，变成了：</p>
 <pre><code>/testInherate:
     post:
       operationId: &quot;testInherate&quot;
       parameters:
       - in: &quot;body&quot;
         name: &quot;xxxxx&quot;
         required: false
       responses:
         200:
           description: &quot;response of 200&quot;
           schema:
             $ref: &quot;#/definitions/ReponseImpl&quot;
 </code></pre>
 <p>如果客户端没有放置swagger，还会报告如下异常：</p>
 <p>Caused by: java.lang.ClassFormatError: Method "testInherate" in class ? has illegal signature "</p>
 <p><strong>解决方法：</strong></p>
 <p>定义body参数的类型的时候，需要使用schema，不能直接使用type。</p>
 <pre><code>/testInherate:
     post:
       operationId: &quot;testInherate&quot;
       parameters:
       - in: &quot;body&quot;
         name: &quot;request&quot;
         required: false
         schema:
           type: string
       responses:
         200:
           description: &quot;response of 200&quot;
           schema:
             $ref: &quot;#/definitions/ReponseImpl&quot;
 </code></pre>
 <h1 id="_2">问题描述：微服务框架服务调用是否使用长连接</h1>
 <p>** 解决方法：**</p>
 <p>http使用的是长连接（有超时时间），highway方式使用的是长连接（一直保持）。</p>
 <h1 id="_3">问题描述：服务断连服务中心注册信息是否自动删除</h1>
 <p>** 解决方法：**</p>
 <p>服务中心心跳检测到服务实例不可用，只会移除服务实例信息，服务的静态数据不会移除。</p>
 <h1 id="_4">问题描述：微服务框架如何实现数据多个微服务间透传</h1>
 <p>** 解决方法：**</p>
 <p>透传数据塞入：</p>
 <pre><code class="language-java">CseHttpEntity&lt;xxxx.class&gt; httpEntity = new CseHttpEntity&lt;&gt;(xxx);
 //透传内容
 httpEntity.addContext(&quot;contextKey&quot;,&quot;contextValue&quot;);
 ResponseEntity&lt;String&gt; responseEntity = RestTemplateBuilder.create().exchange(&quot;cse://springmvc/springmvchello/sayhello&quot;,HttpMethod.POST,httpEntity,String.class);
 </code></pre>
 <p>透传数据获取：</p>
 <pre><code class="language-java">@Override
 @RequestMapping(path=&quot;/sayhello&quot;,method = RequestMethod.POST)
 public String sayHello(@RequestBody Person person,InvocationContext context){
     //透传数据获取
     context.getContext();
     return &quot;Hello person &quot; + person.getName();
 }
 </code></pre>
 <h1 id="_5">问题描述：微服务框架服务如何自定义返回状态码</h1>
 <p>** 解决方法：**</p>
 <pre><code class="language-java">@Override
 @RequestMapping(path = &quot;/sayhello&quot;,method = RequestMethod.POST)
 public String sayHello(@RequestBody Person person){
     InvocationContext context = ContextUtils.getInvocationContext();
     //自定义状态码
     context.setStatus(Status.CREATED);
     return &quot;Hello person &quot;+person.getName();
 }
 </code></pre>
 <h1 id="body-model">问题描述： body Model部分暴露</h1>
 <p>** 解决方法：**</p>
 <p>一个接口对应的body对象中，可能有一些属性是内部的，不想开放出去，生成schema的时候不要带出去，使用：</p>
 <pre><code class="language-java">@ApiModelProperty(hidden = true)
 </code></pre>
 <h1 id="consumer">问题描述：框架获取远端consumer的地址</h1>
 <p>** 解决方法：**</p>
 <p>如果使用http rest方式（使用transport-rest-vertx依赖）可以用下面这种方式获取：</p>
 <pre><code class="language-java">HttpServletRequest request = (HttpServletRequest) invocation.getHandlerContext().get(RestConst.REST_REQUEST);
 String host = request.getRemoteHost();
 </code></pre>
 <p>实际场景是拿最外层的地址，所以应该是LB传入到edgeservice，edgeService再放到context外下传递。</p>
 <h1 id="handler">问题描述：对handler描述</h1>
 <p>** 解决方法：**</p>
 <p>consumer默认的handler是simpleLB，没有配置的时候handler链会使用这个，如果配置了handler，里面一定要包含lb的handler，否则调用报错，需要在文档里面进行说明。</p>
 <h1 id="netty">问题描述：netty版本问题</h1>
 <p>** 解决方法：**</p>
 <p>netty3和netty4是完全不同的三方件，因为坐标跟package都不相同，所以可以共存，但是要注意小版本问题，小版本必须使用的版本。</p>
 <h1 id="_6">问题描述：服务超时设置</h1>
 <p>** 解决方法：**</p>
 <p>在微服务描述文件（microservice.yaml）中添加如下配置：</p>
 <pre><code>servicecomb:
   request:
     timeout: 30000
 </code></pre>
 <h1 id="_7">问题描述：服务治理的处理链顺序是否有要求？</h1>
 <p><strong>解决方法：</strong></p>
 <p>处理链的顺序不同，那么系统工作行为也不同。 下面列举一下常见问题。</p>
 <p>1、loadbalance和bizkeeper-consumer</p>
 <p>这两个顺序可以随机组合。但是行为是不一样的。</p>
 <p>当loadbalance在前面的时候，那么loadbalance提供的重试功能会在bizkeeper-consumer抛出异常时发生，比如超时等。但是如果已经做了fallbackpolicy配置，比如returnnull，那么loadbalance则不会重试。</p>
 <p>如果loadbalance在后面，那么loadbalance的重试会延长超时时间，即使重试成功，如果bizkeeper-consumer设置的超时时间不够，那么最终的调用结果也是失败。</p>
 <p>2、tracing-consumer，sla-consumer，tracing-provider，sla-provider</p>
 <p>这些处理链建议放到处理链的最开始位置，保证成功、失败的情况都可以记录日志（由于记录日志需要IP等信息，对于消费者，只能放到loadbalance后面）。</p>
 <p>如果不需要记录客户端返回的异常，则可以放到末尾，只关注网络层返回的错误。但是如果bizkeeper-consumer等超时提前返回的话，则可能不会记录日志。</p>
 <p>3、建议的顺序</p>
 <p>Consumer: loadbalance, tracing-consumer, sla-consumer, bizkeeper-consumer</p>
 <p>Provider: tracing-provider, sla-provider, bizkeeper-provider</p>
 <p>这种顺序能够满足大多数场景，并且不容易出现不可理解的错误。</p>
 <h1 id="_8">问题描述： 文件上传中配置项最大请求大小的含义</h1>
 <p>配置项： servicecomb.uploads.maxSize</p>
 <p>含义： 请求体中允许的最大字节数，默认值为-1，表示没有限制。</p>


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