使用 HttpWebRequest 发布表单数据

我想发布一些表单数据到一个指定的网址，而不是在我自己的网络应用程序。它有相同的域名，比如“ domain.client.nl”。这个 web 应用程序有一个地址“ web.domain.client.nl”，我想发布的地方的地址是“ idp.domain.client.nl”。 但是我的代码什么都不做，有人知道我做错了什么吗？

伍特

StringBuilder postData = new StringBuilder();
postData.Append(HttpUtility.UrlEncode(String.Format("username={0}&", uname)));
postData.Append(HttpUtility.UrlEncode(String.Format("password={0}&", pword)));
postData.Append(HttpUtility.UrlEncode(String.Format("url_success={0}&", urlSuccess)));
postData.Append(HttpUtility.UrlEncode(String.Format("url_failed={0}", urlFailed)));


ASCIIEncoding ascii = new ASCIIEncoding();
byte[] postBytes = ascii.GetBytes(postData.ToString());


// set up request object
HttpWebRequest request;
try
{
request = (HttpWebRequest)HttpWebRequest.Create(WebSiteConstants.UrlIdp);
}
catch (UriFormatException)
{
request = null;
}
if (request == null)
throw new ApplicationException("Invalid URL: " + WebSiteConstants.UrlIdp);


request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postBytes.Length;
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";


// add post data to request
Stream postStream = request.GetRequestStream();
postStream.Write(postBytes, 0, postBytes.Length);
postStream.Flush();
postStream.Close();
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小开

You are encoding the form incorrectly. You should only encode the values:

StringBuilder postData = new StringBuilder();
postData.Append("username=" + HttpUtility.UrlEncode(uname) + "&");
postData.Append("password=" + HttpUtility.UrlEncode(pword) + "&");
postData.Append("url_success=" + HttpUtility.UrlEncode(urlSuccess) + "&");
postData.Append("url_failed=" + HttpUtility.UrlEncode(urlFailed));

edit

I was incorrect. According to RFC1866 section 8.2.1 both names and values should be encoded.

But for the given example, the names do not have any characters that needs to be encoded, so in this case my code example is correct ;)

The code in the question is still incorrect as it would encode the equal sign which is the reason to why the web server cannot decode it.

A more proper way would have been:

StringBuilder postData = new StringBuilder();
postData.AppendUrlEncoded("username", uname);
postData.AppendUrlEncoded("password", pword);
postData.AppendUrlEncoded("url_success", urlSuccess);
postData.AppendUrlEncoded("url_failed", urlFailed);


//in an extension class
public static void AppendUrlEncoded(this StringBuilder sb, string name, string value)
{
if (sb.Length != 0)
sb.Append("&");
sb.Append(HttpUtility.UrlEncode(name));
sb.Append("=");
sb.Append(HttpUtility.UrlEncode(value));
}
小开

Both the field name and the value should be url encoded. format of the post data and query string are the same

The .net way of doing is something like this

NameValueCollection outgoingQueryString = HttpUtility.ParseQueryString(String.Empty);
outgoingQueryString.Add("field1","value1");
outgoingQueryString.Add("field2", "value2");
string postdata = outgoingQueryString.ToString();

This will take care of encoding the fields and the value names

小开

Try this:

var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");


var postData = "thing1=hello";
postData += "&thing2=world";
var data = Encoding.ASCII.GetBytes(postData);


request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;


using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}


var response = (HttpWebResponse)request.GetResponse();


var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
小开

Use this code:

internal void SomeFunction() {
Dictionary<string, string> formField = new Dictionary<string, string>();
    

formField.Add("Name", "Henry");
formField.Add("Age", "21");
    

string body = GetBodyStringFromDictionary(formField);
// output : Name=Henry&Age=21
}


internal string GetBodyStringFromDictionary(Dictionary<string, string> formField)
{
string body = string.Empty;
foreach (var pair in formField)
{
body += $"{pair.Key}={pair.Value}&";
}


// delete last "&"
body = body.Substring(0, body.Length - 1);


return body;
}
小开 
List<KeyValuePair<string, string>> formField= new List<KeyValuePair<string,string>>();


formField.Add(new KeyValuePair<string, string>("Name", "Henry"));
formField.Add(new KeyValuePair<string, string>("Age", "21"));


var body = string.Join("&", formField.Select(kvp => $"{kvp.Key}={kvp.Value}"));

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