[Dev] [APIM] [Golang] Implementing HTTP PUT in Golang

[Menuka Warushavithana]

Hi,
I'm working on creating a CLI tool for importing and exporting APIs between
different environments (for WSO2 API Manager 3.0.0) using Golang.

I have an issue with importing APIs.
The following curl command works fine.
*`curl -k -F "file=@exported.zip" -X PUT -H "Authorization: Bearer
<access_token>" https://localhost:9292/api/am/publisher/v1.0/import/apis
<https://localhost:9292/api/am/publisher/v1.0/import/apis>`*

The problem is with mapping this to Go code.
Here's what I wrote at first.

func main() {
    data, err := os.Open("./exported.zip")
    accessToken := "<access_token>"
    if err != nil {
        fmt.Println("Error oening file")
        panic(err)
    }

    req, reqErr := http.NewRequest(http.MethodPut, "
https://localhost:9292/api/am/publisher/v1.0/import/apis";, data)
    if reqErr != nil {
        fmt.Println("Error creating request")
        panic(reqErr)
    }

    req.Header.Add("Content-Type", "multipart/form-data") // response is
500 with or without this line
    req.Header.Add("Authorization", "Bearer "+accessToken)

    tr := &http.Transport{
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, // for
skipping errors in https
    }

    client := &http.Client{Transport: tr}
    res, resErr := client.Do(req)

    if resErr != nil {
        fmt.Println("Error in response")
        panic(resErr)
    }

    body, err := ioutil.ReadAll(res.Body)

    fmt.Println("Response:", res)
    fmt.Println("Body:", string(body))
    fmt.Println("Status:", res.Status)

    defer res.Body.Close()
}

This returns a *500 Internal Server Error.*

But the request works fine with *Postman* client. Therefore, I tried
putting the extra headers generated by Postman in Go code.

func main() {
    url := "https://localhost:9292/api/am/publisher/v1.0";
    accessToken := "<access_token>"

    payload := 
strings.NewReader("------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition:
form-data; name=\"file\"; filename=\"./exported.zip\"\r\nContent-Type:
application/zip\r\n\r\n\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW--")

    req, _ := http.NewRequest(http.MethodPut, url, payload)

    req.Header.Add("content-type", "multipart/form-data;
boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW")
    req.Header.Add("authorization", "Bearer "+accessToken)
    req.Header.Add("cache-control", "no-cache")

    tr := &http.Transport{
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, // for
skipping errors in https
    }

    client := &http.Client{Transport: tr}
    resp, _ := client.Do(req)

    if resp != nil {

        body, _ := ioutil.ReadAll(resp.Body)

        fmt.Println(resp)
        fmt.Println(string(body))
    } else {
        fmt.Println("Null Response")
    }

    fmt.Println(resp.Status)
}

This returns a *405 - Method Not Allowed*

So, Postman works. Curl works. Go does not.
I googled on 'multipart/form-data' under HTTP, but that didn't help either.

Your advice is much appreciated in solving this issue.

Thanks and Regards

*Menuka Warushavithana*
*Software Engineering Intern*
*WSO2*

*Moblie:      + <%2B%2094%2011%202145345%20%C2%A0Ext.%205737> 94 77 6979690*

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