【发布时间】：2019-06-20 07:55:05
【问题描述】：
我正在尝试编写一个发布请求函数，该函数将文件从 golang 服务器发送到客户端。代码是从这里 (golang POST data using the Content-Type multipart/form-data) 抄录下来的。无论出于何种原因，我总是得到“404 page not found”，即使通过邮递员完成的相同请求正在命中 endpt 并成功返回。这是一种奇怪的行为，我不太确定如何调试。 （出于测试目的，我对 URL 进行了硬编码以访问本地运行的服务器。）
这是我的代码：
func PostUpload(values map[string]io.Reader, URL string){
fmt.Println("inside PostUpload in outbound")
client := &http.Client{}
var err error
var b bytes.Buffer
w := multipart.NewWriter(&b)
for key, r := range values {
var fw io.Writer
if x, ok := r.(io.Closer); ok {
defer x.Close()
}
// Add an image file
if x, ok := r.(*os.File); ok {
if fw, err = w.CreateFormFile(key, x.Name()); err != nil {
return
}
} else {
// Add other fields
if fw, err = w.CreateFormField(key); err != nil {
return
}
}
if _, err = io.Copy(fw, r); err != nil {
fmt.Println("there was an error")
fmt.Println(err)
}
}
w.Close()
// Now that you have a form, you can submit it to your handler.
// req, err := http.NewRequest("POST", URL, &b)
req, err := http.NewRequest("POST", "http://127.0.0.1:5000/upload", &b)
if err != nil {
fmt.Println("there was an error on http.NewRequest in outbound post file upload")
fmt.Println(err)
}
// Don't forget to set the content type, this will contain the boundary.
req.Header.Set("Content-Type", w.FormDataContentType())
requestDump, err := httputil.DumpRequest(req, true)
if err != nil {
fmt.Println(err)
}
fmt.Println(string(requestDump))
// Submit the request
resp, err := client.Do(req)
if err != nil {
fmt.Println("there was an error on client do in outbound post file upload")
fmt.Println(err)
}
resp_body, _ := ioutil.ReadAll(resp.Body)
var parsed map[string]interface{}
err = json.Unmarshal(resp_body, &parsed)
if err!=nil{
if typeof(resp_body)=="[]uint8"{
fmt.Println("received []uint8, converting and displaying")
fmt.Print(string(resp_body))
}else{
fmt.Println("inside unmarshal error")
fmt.Println(err)
}
}
return
}
这是控制台的输出：
api | 21:16:09 app | inside PostUpload in outbound
api | 21:16:09 app | POST /upload HTTP/1.1
api | Host: 127.0.0.1:5000
api | Content-Type: multipart/form-data; boundary=0ce8aee17e5d00524acd3875d8b4b41dba5f99d8a7796d56289e38f89c64
api |
api | --0ce8aee17e5d00524acd3875d8b4b41dba5f99d8a7796d56289e38f89c64
api | Content-Disposition: form-data; name="file"; filename="/uploads/TIME^2019-01-26 21:16:09.413514444 +0000 UTCFILE^Any_Publishing.txt"
api | Content-Type: application/octet-stream
api |
api | # © 2016 and later: Unicode, Inc. and others.
api | # License & terms of use: http://www.unicode.org/copyright.html#License
api | #
api | # File: Any_Publishing.txt
api | # Generated from CLDR
api | #
api |
api | # Variables
api | $single = \' ;
api | $space = ' ' ;
api | $double = \";
api | $back = \` ;
api |
api | --0ce8aee17e5d00524acd3875d8b4b41dba5f99d8a7796d56289e38f89c64--
api |
api | 21:16:09 app | received []uint8, converting and displaying
api | 404 page not found
有人知道出了什么问题吗？
编辑：
有人建议注释掉 req 上的转储，因为它可能会消耗 req 并将其留空以进行请求。我试过了，结果和上面一样。
有人提到他们想看到成功上传的 curl 请求，所以这里是：
patientplatypus:~/Downloads:15:48:28$curl -X POST -F "file=@./catpic.jpg" http://127.0.0.1:5000/upload
file uploaded successfully!
带有 -v 标志的 curl 的完整转储：
patientplatypus:~/Downloads:15:48:42$curl -v -X POST -F "file=@./catpic.jpg" http://127.0.0.1:5000/upload
Note: Unnecessary use of -X or --request, POST is already inferred.
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 5000 (#0)
> POST /upload HTTP/1.1
> Host: 127.0.0.1:5000
> User-Agent: curl/7.54.0
> Accept: */*
> Content-Length: 264915
> Expect: 100-continue
> Content-Type: multipart/form-data; boundary=------------------------48411aa948b523e2
>
< HTTP/1.1 100 Continue
* HTTP 1.0, assume close after body
< HTTP/1.0 200 OK
< Content-Type: text/html; charset=utf-8
< Content-Length: 27
< Server: Werkzeug/0.14.1 Python/3.6.5
< Date: Sat, 26 Jan 2019 22:12:19 GMT
<
* Closing connection 0
file uploaded successfully!
有人提到他们想查看我试图访问的服务器，所以这里是：https://github.com/patientplatypus/pythonServer
【问题讨论】：
标签： go file-upload server upload http-status-code-404