Question

    private string PostWebRequest(string postUrl, string paramData)
    {

        byte[] bytes = Encoding.UTF8.GetBytes(paramData);

        HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));
        webReq.Method = "POST";
       webReq.ContentType = "application/json";
        webReq.ContentLength = bytes.Length;
        using (Stream newStream = webReq.GetRequestStream())
        {
            newStream.Write(bytes, 0, bytes.Length);
        }
        using (WebResponse res = webReq.GetResponse())
        {
            Stream responseStream = res.GetResponseStream();
            StreamReader streamReader = new StreamReader(responseStream, Encoding.GetEncoding("UTF-8"));
            string str = streamReader.ReadToEnd();
            streamReader.Close();
            responseStream.Close();
            return str;
        }
    }

当我为contentType设置一个值时，它是失败的。像这样

异常：在System.Net.WebConnection.HandleError （System.Net.WebExceptionStatus st，System.Exception e，System.String 其中）[0x00000]在<3acaa45225a54f778710eeee6eff26f77f>：0中 System.Net.WebConnection.ReadDone（System.IAsyncResult结果）在<3acaa45225a54f778710eeee6eff26f77f>：0中的[0x00000] System.Net.Sockets.SocketAsyncResult + <> c.b__27_0 （系统对象状态）在[0x00000]中 <3acaa45225a54f778710ee6eff26f77f>：0在 System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem （）[0x00000]在：0处 System.Threading.ThreadPoolWorkQueue.Dispatch（）[0x00000]在：0处 System.Threading._ThreadPoolWaitCallback.PerformWaitCallback（） [0x00000]在：0中 System.Net.WebConnection.HandleError（System.Net.WebExceptionStatus st，System.Exception e，System.String其中）（在 <3acaa45225a54f778710ee6eff26f77f>：0）重新抛出为WebException：错误获取响应流（ReadDone2）：ReceiveFailure

如果我未将ContentType设置为一个值，它将响应成功。

Answer 1

欢迎来到

尝试以下

tbstatus

HttpObject类

 /// <summary>
    /// Post request 
    /// </summary>
    /// <param name="httpObject"></param>
    /// <param name="parameters"></param>
    /// <returns></returns>
    public string SendRequest(HttpObject httpObject, IDictionary<string, string> parameters)
    {

        var httpWebRequest = (HttpWebRequest)WebRequest.Create(httpObject.Url);
        httpWebRequest.ContentType = "application/json";
        httpWebRequest.Method = httpObject.Method.ToString();

        if (parameters != null)
            foreach (var p in parameters)
            {
                httpWebRequest.Headers.Add(p.Key, p.Value);
            }


        string result = null;

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            streamWriter.Write(httpObject.Json);
            streamWriter.Flush();
            streamWriter.Close();
        }
        try
        {
            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                result = streamReader.ReadToEnd();
            }
        }
        catch (WebException wex)
        {
            using (var streamReader = new StreamReader(wex.Response.GetResponseStream()))
            {
                result = streamReader.ReadToEnd();
            }
        }

        return result;
    }

Answer 2

ajax的默认内容类型是'application/x-www-form-urlencoded; charset=UTF-8'。当您将其设置为"application/json";时。服务器不接受此请求，因为您不发送json，而是发送字节。

将数据发送到服务器时，请使用此内容类型。默认值为“ application / x-www-form-urlencoded; charset = UTF-8”，在大多数情况下都可以。如果您将内容类型显式传递给$ .ajax（），则该内容类型将始终发送到服务器（即使未发送任何数据）。从jQuery 1.6开始，您可以传递false来告诉jQuery不要设置任何内容类型标头。注意：W3C XMLHttpRequest规范规定该字符集始终为UTF-8。指定其他字符集不会强制浏览器更改编码。注意：对于跨域请求，将内容类型设置为application / x-www-form-urlencoded，multipart / form-data或text / plain之外的任何类型，都会触发浏览器向服务器发送预检OPTIONS请求。

.net GetResponse获取响应流（ReadDone2）时出错：ReceiveFailure

2 个答案: