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Merge pull request #244 from fuwensun/pr4-6-2

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ch4-6-fix typo
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ch4-rpc/ch4-06-grpc-ext.md
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@ -248,7 +248,7 @@ func main() {
}
```
首先通过runtime.NewServeMux()函数创建路由处理器，然后通过RegisterRestServiceHandlerFromEndpoint函数将RestService服务相关的REST接口中转到后面的GRPC服务。grpc-gateway提供的runtime.ServeMux类也实现了http.Handler接口，因此可以标准库中的相关函数配合使用。
首先通过runtime.NewServeMux()函数创建路由处理器，然后通过RegisterRestServiceHandlerFromEndpoint函数将RestService服务相关的REST接口中转到后面的GRPC服务。grpc-gateway提供的runtime.ServeMux类也实现了http.Handler接口，因此可以和标准库中的相关函数配合使用。
档GRPC和REST服务全部启动之后，就可以用curl请求REST服务了：