How do I POST to an API with Content-Type: multipart/form-data, []byte parameters and string arguments? I have tried, but it is failing.
Error message:
details: "[301 301 Moved Permanently]<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">
<html>
301 Moved Permanently
<body bgcolor=\"white\">
301 Moved Permanently
<p>The requested resource has been assigned a new permanent URI.</p >
<hr/>Powered by Tengine/2.1.0</body>
</html>
"
Go code:
func NewPost2(url string) ([]byte, error) {
m := make(map[string]interface{}, 0)
m["fileName"] ="good"
m["name"] = Base64ToByte("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")
b, _ := json.Marshal(m)
httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(b))
httpReq.Header.Set("Content-Type", "multipart/form-data;charset=UTF-8")
client := &http.Client{}
resp, err := client.Do(httpReq)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
b, _ := ioutil.ReadAll(resp.Body)
return nil, fmt.Errorf("[%d %s]%s", resp.StatusCode, resp.Status, string(b))
}
respData, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return respData, nil
}
Now, I am very happy with the mood to share my solution
func NewPostFile(url string, paramTexts map[string]interface{}, paramFile FileItem) ([]byte, error) {
// if paramFiles ==nil {
// return NewPost(url,paramTexts,header,transport)
// }
bodyBuf := &bytes.Buffer{}
bodyWriter := multipart.NewWriter(bodyBuf)
for k, v := range paramTexts {
bodyWriter.WriteField(k, v.(string))
}
fileWriter, err := bodyWriter.CreateFormFile(paramFile.Key, paramFile.FileName)
if err != nil {
fmt.Println(err)
//fmt.Println("Create form file error: ", error)
return nil, err
}
fileWriter.Write(paramFile.Content)
contentType := bodyWriter.FormDataContentType()
bodyWriter.Close()
fmt.Println(bodyBuf.String())
resp, err := http.Post(url, contentType, bodyBuf)
if err != nil {
return nil, err
}
defer resp.Body.Close()
fmt.Println(resp)
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
b, _ := ioutil.ReadAll(resp.Body)
return nil, fmt.Errorf("[%d %s]%s", resp.StatusCode, resp.Status, string(b))
}
respData, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
fmt.Println(string(respData))
return respData, nil
}
type FileItem struct {
Key string //image_content
FileName string //test.jpg
Content []byte //[]byte
}
On a 301 response, the new url is specified in the headers of the response, not its body
(see https://en.wikipedia.org/wiki/HTTP_301)
try printing :
resp.Header["Location"]
If you have this error as a final response, this also means that the http.Client chose to not follow this redirection.
The doc says that the dafult policy for a Client is to follow up to 10 redirects.
In order to debug redirects, you can write your own CheckRedirect function, which can for instance print the sequence of urls