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<h1 id="202-edge-service-http-commonhttpedgedispatcher">2.0.2 新特性介绍： Edge Service 通用的 HTTP 转发器 CommonHttpEdgeDispatcher</h1>
<p>Edge Service 提供了非常丰富的 HTTP 转发器，并支持自定义扩展。在 2.0.2 版本之前，缺省提供的转发器都是针对
使用 java-chassis 开发的微服务设计的，这些转发器除了能够转发请求到不同的 transport ， 还能够支持 consumer
端服务治理， 和普通的 consumer 调用类似。 在实际业务中，可能存在不同开发框架并存的情况，也可能包含遗留应用
系统，或者需要将请求转发到其他第三方系统的场景。 2.0.2 提供了一个新的转发器 CommonHttpEdgeDispatcher 支持这些场景。 </p>
<p>CommonHttpEdgeDispatcher 要求目标微服务注册到服务中心，能够被自动发现。新的转发器可以管理实例状态，提供负载均衡策略配置，
提供实例隔离等基本治理功能。 </p>
<p>CommonHttpEdgeDispatcher 能够将请求转发到监听 HTTP 或者 HTTP 2 协议的 Provider， 对于 Provider 的开发框架没有限制，也不
要求 Provider 注册契约信息。 </p>
<h2 id="commonhttpedgedispatcher">使用 CommonHttpEdgeDispatcher</h2>
<p>在 Edge Service 启用 CommonHttpEdgeDispatcher 非常简单， 只需要在 <code>microservice.yaml</code> 中增加下面的配置。 </p>
<pre><code class="language-yaml">servicecomb:
http:
dispatcher:
http:
enabled: true
mappings:
businessV2:
prefixSegmentCount: 1
path: &quot;/http/business/v2/.*&quot;
microserviceName: business
versionRule: 2.0.0
businessV1:
prefixSegmentCount: 1
path: &quot;/http/business/v1/add.*&quot;
microserviceName: business
versionRule: 1.0.0-1.2.0
businessV1_1:
prefixSegmentCount: 1
path: &quot;/http/business/v1/dec.*&quot;
microserviceName: business
versionRule: 1.1.0
</code></pre>
<p>通用的 HTTP 转发器的配置项和 <code>URLMappedEdgeDispatcher</code> 非常类似。 可以配置一系列的 mappings 定义 URL 与
微服务之间的转发关系。 上述配置定义了 3 个 mappings， 第 1 个将 URL 满足 <code>/http/business/v2/.*</code> 的请求
转发到 business 服务 2.0.0 版本实例， 后端服务实际的 URL 为 <code>/business/v2/.*</code> 。 第 2 个演示了灰度转发，
将请求转发到 1.0.0 以上（含）， 1.2.0 以下（不含） 的版本。 </p>
<h2 id="commonhttpedgedispatcher_1">CommonHttpEdgeDispatcher 的治理</h2>
<p>CommonHttpEdgeDispatcher 集成了 loadbalance 模块提供的治理能力， 在 <a href="../../references-handlers/loadbalance.html">负载均衡</a> 里面的治理
能力都可以使用，除了 <code>设置重试策略</code> 。 这个转发器通常被用于转发 UI 请求到后端的静态页面服务，以及遗留的使用 spring
boot 开发的微服务， 或者采用 spring-cloud-huawei 接入服务中心的 spring cloud 微服务应用。 </p>
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