How to solve The remote server returned an error: (400) Bad Request when ContentLength increases

Question

每当我尝试向超过 20 个用户发送通知时，它都会出现错误远程服务器返回错误：(400) 错误请求。我已经尝试了所有的解决方案，但它给出了同样的错误。这是我的代码：-

private string SendGCMNotification(string apiKey, string postData)
    {
        try
        {
            WebRequest wRequest;
            wRequest = WebRequest.Create("https://gcm-http.googleapis.com/gcm/send");
            wRequest.Method = "POST";
            wRequest.ContentType = "application/json;charset=UTF-8";
            wRequest.Headers.Add(string.Format("Authorization: key={0}", apiKey));

            var bytes = Encoding.UTF8.GetBytes(postData);
            wRequest.ContentLength = bytes.Length;

            var stream = wRequest.GetRequestStream();
            stream.Write(bytes, 0, bytes.Length);
            stream.Close();

            var wResponse = wRequest.GetResponse();
            stream = wResponse.GetResponseStream();
            var reader = new StreamReader(stream);
            var response = reader.ReadToEnd();

            var httpResponse = (HttpWebResponse)wResponse;
            var status = httpResponse.StatusCode.ToString();

            reader.Close();
            stream.Close();
            wResponse.Close();

            //TODO check status
        }
        catch (WebException ex)
        {
            Response.Write(ex.Message.ToString());
        }
        return "sent";
    }

我的 web.config 文件 :-

<system.webServer>
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
      </customHeaders>
    </httpProtocol>

    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="30000000" maxUrl="10000" maxQueryString="10000" />
      </requestFiltering>
    </security>

  </system.webServer>

  <system.web.extensions>
    <scripting>
      <webServices>
        <jsonSerialization maxJsonLength="50000000" />
      </webServices>
    </scripting>
  </system.web.extensions>

Answer 1

问题出在我的 postdata 中。<div> 标记被插入到带有端点的数据库中。

这是导致问题的代码

{ "registration_ids": [ "e-9zZTY0LtI:APA91bFTZUYD4kghBu1xU4cO3A9aqzCN_QqX7fZECoQlcGC-PvDg5_fOPMZgNHTBZqk-4jwk6iAfWjJlD6BUu4iGmnXHqjpo-40FR6f4kgjnHGS6TBGOR2Vii7CqxPhvr7OE1RyX8JHy <div style="display:none">viagra.com coupon</div>" ], "data": {"contentTitle":"content title GCM", "message": "some test message"}}

通过从注册 ID 中删除它解决了我的问题

<div style="display:none">viagra.com coupon</div>

How to solve The remote server returned an error: (400) Bad Request when ContentLength increases

How to solve The remote server returned an error: (400) Bad Request when ContentLength increases

c#

asp.net

web-config