xml - Vb.Net - 写入的字节数超过 XML Post 中的内容长度字节

Question

呃，我不断收到 ProtocolViolationException “要写入流的字节超过指定的 Content-Length 字节大小。” 在下面的代码上。

我尝试了多种设置 Content-Length 的方法，但均未成功。

Dim url = "https://domain.com"
Dim req As WebRequest = WebRequest.Create(url)
req.Method = "POST"
req.ContentType = "application/xml"

Dim utf8 As New UTF8Encoding()
req.ContentLength = utf8.GetByteCount(xml.OuterXml) 

xml.Save(req.GetRequestStream()) // throws the exception
req.GetRequestStream().Close()

Dim httpResp As WebResponse = req.GetResponse()
Dim stReader As StreamReader = New StreamReader(httpResp.GetResponseStream())
Dim strResponse As String

strResponse = stReader.ReadToEnd()

Console.WriteLine(strResponse)

我尝试使用 xml.OutXML.Length 设置内容长度

Answer 1

尝试使用WebClient，它使代码更容易，并负责正确刷新和处理所有流：

Dim xml As New XmlDocument
xml.LoadXml("<foo>abc</foo>")
Using client As WebClient = New WebClient
    client.Headers.Item(HttpRequestHeader.ContentType) = "application/xml"
    Dim data As Byte() = Encoding.UTF8.GetBytes(xml.OuterXml)
    Console.WriteLine(Encoding.UTF8.GetString(client.UploadData("https://domain.com", data)))
End Using