如何编写HTTP请求

Question

您好我尝试在C#(Post)中编写HTTP请求,但我需要有关错误的帮助

Expl:我想将DLC文件的内容发送到服务器并重新发送解密的内容.

C#代码

public static void decryptContainer(string dlc_content) 
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://dcrypt.it/decrypt/paste");
    request.Method = "POST";
    request.ContentType = "application/x-www-form-urlencoded";
    request.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";

    using (StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII))
    {
        writer.Write("content=" + dlc_content);
    }

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

    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
    {
        Console.WriteLine(reader.ReadToEnd());
    }
}

在这里我收到了html请求

<form action="/decrypt/paste" method="post">
    <fieldset>
        <p class="formrow">
          <label for="content">DLC content</label>
          <input id="content" name="content" type="text" value="" />
         </p>
        <p class="buttonrow"><button type="submit">Submit »</button></p>
    </fieldset>
</form>

错误信息:

{
    "form_errors": {
      "__all__": [
        "Sorry, an error occurred while processing the container."
       ]
    }
}

如果有人可以帮助我解决问题,那将非常有帮助!

Answer 1

您尚未设置内容长度,这可能会导致问题.您也可以尝试将字节直接写入流而不是首先将其转换为ASCII.(这与您此刻的操作方式相反),例如:

public static void decryptContainer(string dlc_content) 
   {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://dcrypt.it/decrypt/paste");
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";

        byte[] _byteVersion = Encoding.ASCII.GetBytes(string.Concat("content=", dlc_content));

        request.ContentLength = _byteVersion.Length

        Stream stream = request.GetRequestStream();
        stream.Write(_byteVersion, 0, _byteVersion.Length);
        stream.Close();

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

        using (StreamReader reader = new StreamReader(response.GetResponseStream()))
        {
            Console.WriteLine(reader.ReadToEnd());
        }
    }

我个人发现这样的帖子在过去有点"狡猾".您还可以尝试在请求上设置ProtocolVersion.

Answer 2

我会简化你的代码,像这样:

public static void decryptContainer(string dlc_content) 
{
    using (var client = new WebClient())
    {
        var values = new NameValueCollection
        {
            { "content", dlc_content }
        };
        client.Headers[HttpRequestHeader.Accept] = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
        string url = "http://dcrypt.it/decrypt/paste";
        byte[] result = client.UploadValues(url, values);
        Console.WriteLine(Encoding.UTF8.GetString(result));
    }
}

它还确保正确编码请求参数.