几天来，我一直在尝试编写一个将图像远程上传到图像主机（imgur.com）的程序。我使用 Wireshark 嗅探浏览器发送的 http 请求，然后创建具有相似标头和参数的 HttpWebRequest。但是服务器总是给我发回一些奇怪的东西。请看代码（此代码已简化）：
static void Main(string[] args)
{
ServicePointManager.Expect100Continue = false;
CookieContainer cc = new CookieContainer();
List<string> formData = new List<string>();
//The first request - login
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://imgur.com/signin");
configRequest(request, cc);
//add POST params
add(formData, "username", "abcdefgh"); //this is a working account,
add(formData, "password", "abcdefgh"); //feel free to use it if you
add(formData, "remember", "remember"); //want to test
add(formData, "submit", "");
writeToRequestStream(request, formData);
//send request
request.GetResponse();
//The second request - remote upload image
request = (HttpWebRequest)WebRequest.Create("http://imgur.com/upload?sid_hash=9efff36179fef47dc5e078a4575fd96a");
configRequest(request, cc);
//add POST params
formData = new List<string>();
add(formData, "url", "http://img34.imageshack.us/img34/8425/89948070152259768406.jpg");
add(formData, "create_album", "0");
add(formData, "album_title", "Optional Album Title");
add(formData, "album_layout", "b");
add(formData, "edit_url", "0");
writeToRequestStream(request, formData);
//send request
Stream s = request.GetResponse().GetResponseStream();
StreamReader sr = new StreamReader(s);
string html = sr.ReadToEnd();
sr.Close();s.Close();
Console.WriteLine(html + "\n\n");
}
static void add(List<string> formData, string key, string value)
{
formData.Add(HttpUtility.UrlEncode(key) + "=" + HttpUtility.UrlEncode(value));
}
static void configRequest(HttpWebRequest request, CookieContainer cc)
{
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
request.CookieContainer = cc;
request.Credentials = CredentialCache.DefaultCredentials;
request.Accept = "*/*";
request.KeepAlive = true;
request.Referer = "http://imgur.com/";
request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.15) Gecko/20110303 Firefox/3.6.15";
request.Headers.Add("Accept-Language", "en-us,en;q=0.5");
request.Headers.Add("Accept-Encoding", "gzip,deflate");
request.Headers.Add("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
request.Headers.Add("Keep-Alive", "115");
request.Headers.Add("X-Requested-With", "XMLHttpRequest");
request.Headers.Add("Pragma", "no-cache");
request.Headers.Add("Cache-Control", "no-cache");
}
static void writeToRequestStream(HttpWebRequest request, List<string> formData)
{
//build request stream
string queryString = String.Join("&", formData.ToArray());
byte[] byteArray = Encoding.UTF8.GetBytes(queryString);
//write to stream
request.ContentLength = byteArray.Length;
Stream rs = request.GetRequestStream();
rs.Write(byteArray, 0, byteArray.Length);
rs.Close();
}
现在我嗅探我的上传请求（第二个请求）并将其与浏览器的请求进行比较，只有两个区别：
浏览器的 'Connection' 标头 ='keep-alive' 但我的不存在（我不知道为什么 request.Keep-alive 设置为 'true'）
某些浏览器的 cookie 没有出现在我的中。
响应应该是 JSON，如下所示：
{"hashes":"[\"QcvII\"]","hash":"QcvII","album":false,"edit":false}
但是服务器通过一堆特殊字符响应我的请求......我无法找出以上 2 个差异中的哪一个导致我的代码不起作用。如果您能帮助我使此代码正常工作，我将不胜感激。我是新手，所以如果我的代码或我的表达很愚蠢，请不要怪我。
任何人都可以帮助使此代码正常工作吗？
P/S：我正在使用 .net 框架 4