VB6 POST 到具有内容类型表单数据的服务器不接收参数

Question

我正在尝试使用 Content-Type=form-data 向服务器发出 post 请求。这是在 VB6（是的，visual basic6）中。请求调用成功，但服务端获取不到参数

为了最简单，我正在使用 httpbin.org 进行测试。

Dim msxml As msxml.XMLHTTPRequest
Dim data As String
Dim boundary As String

Set msxml = New msxml.XMLHTTPRequest


boundary = "----WebKitFormBoundary7MA4YWxkTrZu0gW"

msxml.Open "POST", "http://httpbin.org/post", False

msxml.setRequestHeader "Content-Type", "multipart/form-data;Charset=UTF-8; boundary=" & boundary

data = ""
data = data & boundary & vbCrLf
data = data & "Content-Disposition: form-data; name=""param1""" & vbCrLf
data = data & vbCrLf
data = data & "data for param1" & vbCrLf

data = data & boundary & vbCrLf
data = data & "Content-Disposition: form-data; name=""param2""" & vbCrLf
data = data & vbCrLf
data = data & "other data for param2" & vbCrLf

data = data & boundary & "--"

msxml.Send data

Debug.Print msxml.responseText

得到的响应是：

{
  "args": {},
  "data": "",
  "files": {},
  "form": {},
  "headers": {
    "Accept": "*/*",
    "Accept-Encoding": "gzip, deflate",
    "Accept-Language": "es",
    "Cache-Control": "no-cache",
    "Connection": "close",
    "Content-Length": "216",
    "Content-Type": "multipart/form-data;Charset=UTF-8; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW",
    "Host": "httpbin.org",
    "User-Agent": "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET4.0C; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0E)"
  },
  "json": null,
  "origin": "181.45.250.169",
  "url": "http://httpbin.org/post"
}

如您所见，"form" 属性是空的。

预期响应：

"form": {
    "param1": "data for param1",
    "param2": "other data for param2"
},

我已经尝试过使用 WinHttpRequest 和其他方法，结果总是一样。

有什么建议吗？

Answer 1

这一行之后

data = data & "other data for param2" & vbCrLf

在此行之前

msxml.Send data

试试放

data = data & boundary & "--"

以语法上有效的方式结束表单正文。

Answer 2

改变什么：

boundary = "----WebKitFormBoundary7MA4YWxkTrZu0gW"

至：

boundary = "WebKitFormBoundary7MA4YWxkTrZu0gW"

... 相反，然后在需要的地方用“--”（而不是“----”）作为前缀。

“--”前缀不属于此处，并且您连续两个：

msxml.setRequestHeader "Content-Type", "multipart/form-data;Charset=UTF-8; boundary=" & boundary

通过将“--”加倍，您似乎把自己弄糊涂了。连字符不是边界值的一部分。

Answer 3

感谢所有帮助过我的人。

除了向我建议的边界错误外，我尝试没有成功，因为我缺少参数的 Content-Type。

添加 Content-Type 和正确的边界字符串，post 有效

Dim msxml As msxml.XMLHTTPRequest
Dim data As String
Dim boundary As String

Set msxml = New msxml.XMLHTTPRequest

boundary = "MyCustomBoundary7MA4YWxkTrZu0gW"

msxml.Open "POST", "http://httpbin.org/post", False

msxml.setRequestHeader "Content-Type", "multipart/form-data;Charset=UTF-8; boundary=" & boundary

data = ""
data = data & "--" & boundary & vbCrLf
data = data & "Content-Disposition: form-data; name=""param1""" & vbCrLf
data = data & "Content-Type: text/plain" & vbCrLf & vbCrLf
data = data & "data for param1" & vbCrLf

data = data & "--" & boundary & vbCrLf
data = data & "Content-Disposition: form-data; name=""param2""" & vbCrLf
data = data & "Content-Type: text/plain" & vbCrLf & vbCrLf
data = data & "other data for param2" & vbCrLf

data = data & "--" & boundary & "--"

msxml.Send data

Debug.Print msxml.responseText

VB6 POST 到具有内容类型表单数据的服务器不接收参数

VB6 POST to a server with content-type form-data doesn't receive the parameters

vb6

post

xmlhttprequest

request