如何使用URL操作在golang中代理GET请求

Question

I want to build a golang service which will listen for GET request, do some URL manipulation and then proxy a new request (to the manipulated URL) back to the browser:

(from browser -> server) GET http://www.example.com/7fbsjfhfh93hdkwhfbf398fhkef93..

(server manipulates URL - decrypts "7fbsjfhfh93hdkwhfbf398fhkef93.." -> "my-super-resource")

(server -> URL resource) GET http://www.somewhereelse.com/my-super-resource

(server -> browser) Response from http://www.somewhereelse.com/my-super-resource passed on to browser (using cors)

The whole chain will need to be synchronous which is ok. Is there a decent proxy library which allows for this sort of thing?

Answer 1

You can do something like this in less than 10 lines of code with the Sling package:

type Foo struct {
    Bar string `json:"bar"`
}

func Handler(w http.ResponseWriter, r *http.Request) {
    // Get the URL and decrypt it
    url := getUrl(r)
    decryptedUrl := decryptUrl(url)

    // Use the decrypted URL to make a request to another service
    var data *Foo
    req, err := sling.New().Get(decryptedUrl).Receive(data)
    if err != nil {
         // Handle error...
    }

    // Respond to the original request using the data from the other service
    respond(w, http.StatusOK, data)
}