您可以设置一个不透明的网址。

You can set an opaque url.

假设您希望url指向 http://example.com/test（a），您可以这样做：

Assuming you want the url to point to http://example.com/test(a) you would want to do:

req.NewRequest("GET", "http://example.com/test(a)", nil)
req.URL = &url.URL{
    Scheme: "http",
    Host:   "example.com",
    Opaque: "//example.com/test(a)",
}
client.Do(req)

示例：http://play.golang.org/p/09V67Hbo6H

文档： http://golang.org/pkg/net/url/#URL