HttpWebRequest POST给500服务器错误 [英] HttpWebRequest POST gives 500 server error

问题描述

我需要从我的应用程序中获取经过身份验证的httpwebrequest.对我的请求的响应应为json格式.为此，我正在使用以下代码:

I need to make from my app an authentificated httpwebrequest. the response to my request should be in json format. for this i'm using the code below:

// Create the web request 
        Uri address = new Uri("http://www.mysite.com/remote/user/login/format/json");
        HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
        request.Method = "POST";
        request.UseDefaultCredentials = false;
        request.Credentials = new NetworkCredential(UserName, Password);
        request.PreAuthenticate = true;
        request.ContentType = "application/x-www-form-urlencoded";
        request.Accept = "application/json";

        string data = string.Format("username={0}&password={1}", otherusername, otherpassword);
        // Create a byte array of the data we want to send  
        byte[] byteData = UTF8Encoding.UTF8.GetBytes(data);

        // Set the content length in the request headers  
        request.ContentLength = byteData.Length;

         //Write data  
        using (Stream postStream = request.GetRequestStream())
        {
            postStream.Write(byteData, 0, byteData.Length);
        }


        // Get response
        try
        {
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                // Get the response stream  
                StreamReader reader = new StreamReader(response.GetResponseStream());

                // Console application output  
                jsonResponse = reader.ReadToEnd();
                reader.Close();
            }

            user = new User();
            JObject o = JObject.Parse(jsonResponse);
            user.Unguessable_id = (string)o["unguessable_id"];
            user.Print_id = (string)o["print_id"];
            user.Rrid = (string)o["rrid"];
            user.Raid = (string)o["raid"];

        }
        catch (WebException ex) {
            errorMessage = ex.Message;
        }

问题在于，第一次调用它总是在服务器上显示500错误.并且请求失败.如果我重做呼叫(通过在浏览器中刷新)，则请求成功.

the problem is that the very first call it always gives a 500 error on the server. and the request fails. if i redo the call(by making an refresh in my browser) the request is successful.

在正常情况下，请求应如下所示:

the request should look like this in normal conditions:

POST /remote/user/login/format/json HTTP/1.1
Host: <yourhost>

username=user&password=pass

但是当服务器发出500错误时，他收到了如下信息:

but when the server sends out the 500 error he received something like this:

username=user&password=passwordPOST /remote/user/login/format/json HTTP/1.1

知道为什么会这样吗?在我的测试应用程序中，如果我刷新使httpwebrequest调用成功的页面.

any idea why this is happening? in my test app if i refresh the page that makes the httpwebrequest the call is successful.

安装Fiddler后，发出的请求如下所示:

after installing Fiddler the requests made look like this:

=>产生500的那个

=> the one that generates 500

POST http://www.mysite.com/remote/user/login/format/json HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Accept: application/json
Host: www.mysite.com
Content-Length: 30
Expect: 100-continue
Connection: Keep-Alive

username=user&password=pass

=>刷新一次

POST http://www.mysite.com/remote/user/login/format/json HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Accept: application/json
Authorization: Basic ZGNpOkFpR2g3YWVj
Host: www.mysite.com
Content-Length: 30
Expect: 100-continue
Connection: Keep-Alive

username=user&password=pass

似乎授权:基本ZGNpOkFpR2g3YWVj 未包含在第一个请求中……为什么发生?(我对两个请求都使用相同的代码)

it seems that Authorization: Basic ZGNpOkFpR2g3YWVj is not included in the first request...why is that happening?(i'm using the same code for both requests)

推荐答案

我需要添加:

request.Headers.Add("Authorization: Basic ZGNpOkFpR2g3YWVj");

虽然很奇怪，但第二个请求却是自动添加的.

weird though that for the second request it was added automatically..

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