Question

我有一个程序，用户使用URL编码的查询字符串输入完整的URL，并将其发送到Web。

我在vb2005中使用httpwebrequest

我从网站上收到错误I should send a content length

如果网址为http://www.someurl.com/query.php?q=somtext&param1=paramtext&param2=paramtext2

如何从网址获取内容长度，因为无法自动知道这一点？

修改

我决定使用它，这是正确的

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

Answer 1

问题在于您指定方法“POST”，但将参数作为URL传递是“GET”。您需要使用GET方法，或者需要执行POST（将参数写入请求流）。

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

获取httpwebrequest内容长度vb2005

1 个答案: