I have a HTTP API and its client written in Go. The client side code is:
func upload(link, dir, name string, r io.Reader) {
var buf bytes.Buffer
mw := multipart.NewWriter(&buf)
mw.WriteField("dir", dir)
mw.WriteField("name", name)
ff, _ := mw.CreateFormFile("file", name)
io.Copy(ff, r)
mw.Close()
hc := http.Client{Timeout: time.Minute}
req, _ := http.NewRequest("POST", link, &buf)
req.Header.Set("X-Key", "api-key")
req.Header.Set("Content-Type", mw.FormDataContentType())
start := time.Now()
resp, _ := hc.Do(req)
diff := time.Since(start)
defer resp.Body.Close()
if resp.StatusCode == http.StatusOK {
fmt.Printf("Upload OK, elapsed=%v\n", diff)
} else {
data, _ := ioutil.ReadAll(resp.Body)
fmt.Printf("Upload failed, elapsed=%v, http_code=%d, data=%s", diff,
resp.StatusCode, data)
}
}
if compiled using Go 1.10.1, the client program uploads a test file about
4K in 250 milliseconds, while compiled using Go1.11, it costs 10 seconds to
upload! and the server is in local network. Originally the client code
uses io.Pipe to avoid memory consumption, in order to eliminate any
improper use of pipe, I re-write it into the above version, no difference
observed. Also, after we spotted the problem, the server side code is
also re-compiled using Go1.10, but still no difference. It seems only
related to the client side.
Another important symptom is that the same compiled code, if running on
another server (in the same LAN), the problem disappeared, yet another
server will cost about 2 seconds. That is to say, the problem has
something to do with conditions of the server, probably some network issues
we don't know yet. But the problem only occur with Go 1.11.
Is there anything changed in the http client library of 1.11 which may
cause this problem?
Thank you!
Xiangrong
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
