## Proxy (代理) 中間件
Proxy 提供 HTTP / WebSocket 反向代理中間件。它使用已配置的負載平衡技術將請求轉發到上游服務器。
*用法*
```go
url1, err := url.Parse("http://localhost:8081")
if err != nil {
e.Logger.Fatal(err)
}
url2, err := url.Parse("http://localhost:8082")
if err != nil {
e.Logger.Fatal(err)
}
e.Use(middleware.Proxy(&middleware.RoundRobinBalancer{
Targets: []*middleware.ProxyTarget{
{
URL: url1,
},
{
URL: url2,
},
},
}))
```
### 自定義配置
*用法*
```go
e := echo.New()
e.Use(middleware.ProxyWithConfig(middleware.ProxyConfig{}))
```
### 配置
```go
// ProxyConfig defines the config for Proxy middleware.
ProxyConfig struct {
// Skipper defines a function to skip middleware.
Skipper Skipper
// Balancer defines a load balancing technique.
// Required.
// Possible values:
// - RandomBalancer
// - RoundRobinBalancer
Balancer ProxyBalancer
}
```
*默認配置*
| 名稱 | 值 |
| ------- | -------------- |
| Skipper | DefaultSkipper |
### [示例](https://github.com/labstack/echox/blob/master/cookbook/reverse-proxy)
