用大猩猩mux检索可选查询变量? [英] Retrieve optional query variables with gorilla mux?

问题描述

我正在编写一个可以采用POST或GET的处理程序.因此，我希望可以说:

I'm writing a handler that can take either POST or GET. As such, I want the option of being able to say:

http://host/query?parm1=value&parm2=value

我当时以为大猩猩多人种会给我:

I was assuming that Gorilla mux would then give me:

{
    "parm1": "value",
    "parm2": "value
}

但 mux.Vars(r)为空.我知道使用 .Query("key"，"value" 将使参数成为必需参数，这不是我想要的.我缺少什么?

but mux.Vars(r) is empty. I'm aware that using .Query("key", "value" will make the parameters mandatory, which isn't what I want. What am I missing?

推荐答案

正如评论中所反映的，基本答案是那不是mux的目的". mux 非常擅长分解URL的 path 部分，并将这些组件转换为变量.举一个假设的例子，一个提供有关一个国家的信息的呼叫可能具有如下所示的规范:

As reflected in a comment, the basic answer is "that's not what mux is for". mux is great at picking apart the path portion of a URL, and turning the components into variables. To give a hypothetical example, a call that gives information about a country might have a spec that looks like this:

country/{code}

并接受如下所示的呼叫:

and accept calls that look like this:

http://myhost/country/DE

您将获得 code 参数的值，如下所示:

You'd get the value of the code parameter like this:

code := mux.Vars(r)["code"]

如果要传递查询变量，则不要使用mux进行.只需从请求中直接获取它们即可.因此，给出了替代查询语法:

If you want to pass query variables, you don't do that with mux. Just grab them straight from the request. So given the alternative query syntax:

http://myhost/country?code=DE

你会做的:

code := r.URL.Query().Get("code")

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