Hi,

I am trying to execute commands on kubelet agent in Kubernetes cluster and it uses SPDY/3.1.
When I run this function:

func PostRequest(client *http.Client, bodyData []byte) (*http.Response, error){
        url := "https://<node_ip>:10250/exec/default/nginxPod/nginx?command=ls&command=/&input=1&output=1&tty=0"
	req, _ := http.NewRequest("POST", url, bytes.NewBuffer(bodyData))
	req.Header.Set("X-Stream-Protocol-Version", "v2.channel.k8s.io")
	req.Header.Set("X-Stream-Protocol-Version", "channel.k8s.io")
	req.Header.Set("Upgrade", "SPDY/3.1")
	req.Header.Set("Connection","upgrade")
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	resp, err := (*client).Do(req)

	return resp, err
}

The status of resp is 101 Switching Protocols. I can't read it, because if I will try it will stuck:

bodyBytes, _ := ioutil.ReadAll(r.Body)

So I used your library with the following code (I took it from your example):

url2 := "https://123.123.123.123:10250/exec/default/mypod/mycontainer?command=ls&command=/&input=1&output=1&tty=1"
client, err := spdy.NewClient("123.123.123.123:10250")
if err != nil {
	//handle error here
}
req, err := http.NewRequest("POST", url2, nil)
if err != nil {
	//handle error here
}

req.Header.Set("X-Stream-Protocol-Version", "v2.channel.k8s.io")
req.Header.Set("X-Stream-Protocol-Version", "channel.k8s.io")
req.Header.Set("Upgrade", "SPDY/3.1")
req.Header.Set("Connection","upgrade")
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

//now send the request to obtain a http response
res, err := client.Do(req)
if err != nil {
	//something went wrong
}

//now handle the response
data := make([]byte, int(res.ContentLength))
_, err = res.Body.(io.Reader).Read(data)
fmt.Println(string(data))
fmt.Println(res.Header)
res.Body.Close()

After I run it, it failed with the following errors:

[SPDY] 2020/04/04 23:07:35 session.go:197: WARN: communication error: use of closed network connection
[SPDY] 2020/04/04 23:07:35 proxy.go:20: ERROR in NewClientStream: cannot create stream
404 page not found

Any idea why it failed?
With my function it returned the 101 status but with your it returns 404.