Golang：获取未命名的参数

Question

For example, I have a request:

POST /api/users/1/categories/2/posts/3

How can I access this params?

I've tried:

req.ParseMultipartForm(defaultMaxMemory)

req.Form.Get("id")
req.Form.Get("1")
req.Form.Get("_1")

But it doesn't work.

Same question about GET:

GET /api/users/1/categories/2/posts/3

How to get not named params?

req.URL.Query().Get(???)

Answer 1

If you are using the default http server library, you'll need to parse the Url path parts and extract them.

There are libraries like Gorilla Mux (which I personally like) that you can use to add this logic automatically. http://www.gorillatoolkit.org/pkg/mux

Using Gorilla/mux, when you register your handler, you register it like so:

r := mux.NewRouter()
r.HandleFunc("/api/users/{userId}/categories/{categoryId}/posts/{postId}", 
             MyHandler)

And then in your handler you can access them:

vars := mux.Vars(request)
userId := vars["userId"]
// etc...