Accessing HTTP POST parameters in Go

边缘青年_739d · · 489 次点击 · · 开始浏览

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I ran into a little issue as I tried to POST to a Go backend using Axios but I could not get the parameters I was sending.

I was doing this:

func handleReq(w http.ResponseWriter, req *http.Request) {
    err := req.ParseForm()
    if err != nil {
        panic(err)
    }
    v := req.Form
    owner := req.Form.Get("owner")
    name := req.Form.Get("name")
    //...
}

but the two parameters I was looking for were not available. Why?

Turns out that I was assuming Axios sent the parameters using Content-Type:application/x-www-form-urlencoded but by default it’s using Content-Type:application/json.

Note: you can configure it to use application/x-www-form-urlencoded, check https://github.com/axios/axios#using-applicationx-www-form-urlencoded-format

This means that to access the parameters I need to decode them using json.Decoder.

Here is some sample code that does the trick:

type myData struct {
    Owner string
    Name  string
}

func handleAddNewRepo(w http.ResponseWriter, req *http.Request) {
    decoder := json.NewDecoder(req.Body)

    var data myData
    err := decoder.Decode(&data)
    if err != nil {
        panic(err)
    }

    owner := data.Owner
    name := data.Name
    //...
}

https://flaviocopes.com/golang-http-post-parameters/

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