[英]c# HTTP 400 error (Bad Request) thrown by HttpWebRequest (intermitent)
[英]C# HttpWebRequest send xhr request - 400 bad request
我必须从 C# 发送 ajax 请求。 在浏览器中,请求如下所示:
Request URL:https://sts-service.mycompany.com/UPNFromUserName
Request method:POST
Remote address:xxxx
Status code:
200
Version:HTTP/2.0
Referrer Policy:strict-origin-when-cross-origin
标题:
Host: sts-service.mycompany.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: https://sts.mycompany.com/
Content-type: application/x-www-form-urlencoded
Content-Length: 17
Origin: https://sts.mycompany.com
DNT: 1
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
参数:表单数据:
MS.Aution
饼干:没有饼干
在 C# 中,我的要求是:
WebRequest webRequest = WebRequest.Create("https://sts-service.mycompany.com/UPNFromUserName");
((HttpWebRequest)webRequest).Referer = "https://sts.mycompany.com/";
((HttpWebRequest)webRequest).Host = "sts-service.mycompany.com";
((HttpWebRequest)webRequest).KeepAlive = true;
((HttpWebRequest)webRequest).AllowAutoRedirect = true;
((HttpWebRequest)webRequest).UseDefaultCredentials = true;
((HttpWebRequest)webRequest).UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0";
webRequest.ContentType = "application/x-www-form-urlencoded";
((HttpWebRequest)webRequest).Accept = "*/*";
((HttpWebRequest)webRequest).Headers.Add("Origin", "https://sts.mycompany.com");
((HttpWebRequest)webRequest).Headers.Add("Accept-Encoding", "gzip, deflate, br");
((HttpWebRequest)webRequest).Headers.Add("Accept-Language", "en-US,en;q=0.5");
((HttpWebRequest)webRequest).Headers.Add("Upgrade-Insecure-Requests", @"1");
((HttpWebRequest)webRequest).Headers.Add("DNT", @"1");
((HttpWebRequest)webRequest).AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
webRequest.Method = HttpRequestType.POST.ToString();
string msg = "MSCnE.Automation";
webRequest.ContentLength = msg.Length;
Stream reqStream = webRequest.GetRequestStream();
byte[] msgb = System.Text.Encoding.UTF8.GetBytes(msg);
reqStream.Write(msgb, 0, msgb.Length);
reqStream.Close();
var response = (HttpWebResponse)webRequest.GetResponse();
StreamReader sr = new StreamReader(response.GetResponseStream());
string Result = sr.ReadToEnd();
response.Close();
我得到错误:
远程服务器返回错误:(400) 错误请求。
类型是json
但在 Headers 内容类型是application/x-www-form-urlencoded
也许这就是原因?
沿着这些路线的东西(未测试):
public async Task<string> SendPOST()
{
var dict = new Dictionary<string, string>();
dict.Add("DNT", "1");
dict.Add("someformdata","MSCnE.Automation");
using (var formdata = new System.Net.Http.FormUrlEncodedContent(dict))
{
//do not use using HttpClient() - https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpclient
using (System.Net.Http.HttpClient httpClient = new System.Net.Http.HttpClient())
{
formdata.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse("application/x-www-form-urlencoded");
formdata.Headers.ContentType.CharSet = "UTF-8";
httpClient.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0");
using (var response = await httpClient.PostAsync("https://sts-service.mycompany.com/UPNFromUserName", formdata))
{
if (response.IsSuccessStatusCode)
{
var postresult = await response.Content.ReadAsStringAsync();
return postresult;
}
else
{
string errorresult = await response.Content.ReadAsStringAsync();
return errorresult;
}
}
}
}
}
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