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我有一个程序,用户在其中输入带有 URL 编码查询字符串的完整 URL,并将其发送到网络。

我在 vb2005 中使用 httpwebrequest

我从网站上得到一个错误说I should send a content length

如果 URL 是http://www.someurl.com/query.php?q=somtext¶m1=paramtext¶m2=paramtext2

如何从 URL 获取内容长度,因为无法自动知道这一点?

编辑

我决定用这个,这对吗

Private Function GetHtmlFromUrl(ByVal url As String, _
                                   Optional ByVal PostData As String = vbNullString) As String

        If url.ToString() = vbNullString Then
            Throw New ArgumentNullException("url", "Parameter is null or empty")
        End If
        Dim html As String = vbNullString
        Dim myUrl As New System.Uri(url)
        Dim request As HttpWebRequest = WebRequest.Create(url)
        With request
            .ContentType = "Content-Type: application/x-www-form-urlencoded"
            .Method = "POST"
            .UserAgent = "Mozilla/4.0 (MSIE 6.0; Windows NT 5.1)"
            .Referer = "http://www.google.com"
            .ContentLength = myUrl.Query.Length
        End With



        Try
            Dim response As HttpWebResponse = request.GetResponse()
            Dim reader As StreamReader = New StreamReader(response.GetResponseStream())
            html = Trim$(reader.ReadToEnd)
            Return html
        Catch ex As WebException
            Return ex.Message
        End Try

    End Function
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1 回答 1

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问题是您正在指定方法“POST”,但将参数作为 URL 传递是“GET”。您要么需要使用 GET 方法,要么需要执行 POST(将参数写入请求流)。

http://www.codeproject.com/KB/webservices/HttpWebRequest_Response.aspx

于 2011-03-25T13:35:07.670 回答