远程服务器返回错误：（500）Internal Server Error。 GetRequest（）C＃
[英]The remote server returned an error: (500) Internal Server Error. GetRequest() C#
问题描述
I've tried to figure this out myself, but I can't get any useful solution. 
我试图自己解决这个问题，但是我找不到任何有用的解决方案。 I want to send a request to a website and get the processed results. 我想向网站发送请求并获取处理后的结果。 I've had a problem with this already (see How do I fill in a website form and retrieve the result in C#? ) but I was able to solve it with the website stated there. 我已经遇到了问题（请参阅如何填写网站表单并使用C＃检索结果？ ），但是我能够使用此处说明的网站来解决此问题。 Now I'm trying to access yet another website ( http://motif-x.med.harvard.edu/motif-x.html ) with the following code: 现在，我尝试使用以下代码访问另一个网站（ http://motif-x.med.harvard.edu/motif-x.html ）：
ServicePointManager.Expect100Continue = false;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://motif-x.med.harvard.edu/cgi-bin/multimotif-x.pl");
request.Credentials = CredentialCache.DefaultCredentials;
request.ProtocolVersion = HttpVersion.Version10; // Motif-X uses HTTP 1.0
request.KeepAlive = false;
request.Method = "POST";
string motives = "SGSLDSELSVSPKRNSISRTH";
string postData = "fgdata=" + motives + "&fgcentralres=S&width=21";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "multipart/form-data";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
WebResponse response = request.GetResponse();
This gives me the following exception: 这给了我以下例外：
The remote server returned an error: (500) Internal Server Error.
Is there anything you can do to prevent this? 您有什么办法可以防止这种情况发生？
In case you want to manually make an input to the site: 如果您想手动输入站点：
Text area for the data set: SGSLDSELSVSPKRNSISRTH 数据集的文本区域： SGSLDSELSVSPKRNSISRTH
Central character (in basic options): S 中心字符（在基本选项中）：S
You'll get redirected to the result's site - and it may take a while to process. 您将被重定向到结果的网站-可能需要一段时间才能处理。 Could that be actually the reason for the exception? 那真的是例外的原因吗？
4 个解决方案
解决方案1
5 已采纳 2011-09-01 14:37:27
If you look at the documentation you can see that for a "multipart/form-data" sending data "POST" is very different than "application/x-www-form-urlencoded". 如果查看文档，您会发现对于“ multipart / form-data”，发送数据“ POST”与“ application / x-www-form-urlencoded”非常不同。 For your case, you would have to send something like this: 对于您的情况，您将必须发送以下内容：
Content-Type: 内容类型：
Content-Type: multipart/form-data; boundary=---------------------------7db1af18b064a
POST: POST：
-----------------------------7db1af18b064a
Content-Disposition: form-data; name="fgdata"
SGSLDSELSVSPKRNSISRTH
-----------------------------7db1af18b064a
Content-Disposition: form-data; name="fgcentralres"
S
-----------------------------7db1af18b064a
Content-Disposition: form-data; name="width"
21
-----------------------------7db1af18b064a--
these links can help you for sending this data format, but in your case you should avoid sending the file: 这些链接可以帮助您发送此数据格式，但是在您的情况下，应避免发送文件：
POSTING MULTIPART/FORM-DATA USING .NET WEBREQUEST 使用.NET WEBREQUEST发布多部分/表单数据
http://www.groupsrv.com/dotnet/about113297.html http://www.groupsrv.com/dotnet/about113297.html
With some HTTP analyzer, you can check the sending data this simple HTML code 使用一些HTTP分析器，您可以检查发送数据的简单HTML代码
<html>
<body>
<form action="http://motif-x.med.harvard.edu/cgi-bin/multimotif-x.pl" enctype="multipart/form-data" method="post">
<input type="text" name="fgdata" value="SGSLDSELSVSPKRNSISRTH" /><br />
<input type="text" name="fgcentralres" value="S" /><br />
<input type="text" name="width" value="21" /><br />
<input type="submit" value="Send" />
</form>
</body>
</html>
解决方案2
1 2012-09-08 23:37:52
我设置了UserAgent，问题解决了。
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)";
解决方案3
0 2014-11-09 01:58:08
I'm assuming you're trying to access motif-x programatically. 我假设您正在尝试以编程方式访问motif-x。 There is an implemented version in R you can use: R中有一个已实现的版本，您可以使用：
https://github.com/omarwagih/motifx https://github.com/omarwagih/motifx
Good luck. 祝好运。
解决方案4
0 2011-09-02 08:43:41
Thanks a lot for your help! 非常感谢你的帮助！ I could make it work with the following code, in case anyone else encounters this problem: 如果其他任何人遇到此问题，我可以将其与以下代码一起使用：
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(
"http://motif-x.med.harvard.edu/cgi-bin/multimotif-x.pl");
request.ProtocolVersion = HttpVersion.Version10;
request.Method = "POST";
string boundary = "---------------------------7db1af18b064a";
string newLine = "\r\n";
string postData = "--" + boundary + newLine +
"Content-Disposition: form-data; name=\"fgdata\"" + newLine + newLine + "SGSLDSELSVSPKRNSISRTH" + newLine +
"--" + boundary + newLine +
"Content-Disposition: form-data; name=\"fgcentralres\"" + newLine + newLine + "S" + newLine +
"--" + boundary + newLine +
"Content-Disposition: form-data; name=\"width\"" + newLine + newLine + "21" + newLine +
"--" + boundary + "--";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "multipart/form-data; boundary=" + boundary;
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
using (WebResponse response = request.GetResponse())
using (Stream resSteam = response.GetResponseStream())
using (StreamReader sr = new StreamReader(resSteam))
File.WriteAllText("SearchResults.html", sr.ReadToEnd());
System.Diagnostics.Process.Start("SearchResults.html");
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