如何编写HTTP请求

本文关键字：请求 HTTP 何编写 | 更新日期: 2023-09-27 18:12:25

你好，我试图用C#(Post(编写一个HTTP请求，但我需要帮助处理错误

Expl：我想将DLC文件的内容发送到服务器，并接收解密的内容。

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());
    }
}

在这里我得到了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>

错误消息：

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

如果有人能帮我解决这个问题，那将是非常有帮助的！

如何编写HTTP请求

您没有设置内容长度，这可能会导致问题。您也可以尝试直接将字节写入流，而不是先将其转换为ASCII。。(用与现在相反的方式做(，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，在过去，这样的帖子有点"坐立不安"。您也可以尝试根据请求设置ProtocolVersion。

我会简化您的代码，如下所示：

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));
    }
}

它还确保对请求参数进行正确编码。

public string void decryptContainer(string dlc_content) //why not return a string, let caller decide what to do with it.
{
    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";//sure this is needed? Maybe just match the one content-type you expect.
    using (StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII))
    {
        writer.Write("content=" + Uri.EscapeDataString(dlc_content));//escape the value of dlc_content so that the entity sent is valid application/x-www-form-urlencoded
    }
    using(HttpWebResponse response = (HttpWebResponse)request.GetResponse())//this should be disposed when finished with.
    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
    {
        return reader.ReadToEnd();
    }
}

实际发送的内容可能仍然存在问题。

我马上看到的一个问题是，您需要对content参数的值进行URL编码。使用HttpUtility.UrlEncode()。除此之外，可能还有其他问题，但很难说不知道服务的作用。该错误过于通用，可能意味着任何

请求。还应设置ContentLength。

此外，您使用ASCII编码与使用UTF8编码有什么原因吗？

首先获取与响应相关的流，然后将其传递到Streamreader，如下所示：

    Stream receiveStream = response.GetResponseStream();       
    using (StreamReader reader = new StreamReader(receiveStream, Encoding.ASCII))
    {
        Console.WriteLine(reader.ReadToEnd());
    }

因为我不能评论Jon Hanna的解决方案。这为我解决了问题：Uri。EscapeDataString

        // this is what we are sending
        string post_data = "content=" + Uri.EscapeDataString(dlc_content);
        // this is where we will send it
        string uri = "http://dcrypt.it/decrypt/paste";
        // create a request
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
        request.KeepAlive = false;
        request.ProtocolVersion = HttpVersion.Version10;
        request.Method = "POST";
        // turn our request string into a byte stream
        byte[] postBytes = Encoding.ASCII.GetBytes(post_data);
        // this is important - make sure you specify type this way
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = postBytes.Length;
        Stream requestStream = request.GetRequestStream();
        // now send it
        requestStream.Write(postBytes, 0, postBytes.Length);
        requestStream.Close();
        // grab te response and print it out to the console along with the status code
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Console.WriteLine(new StreamReader(response.GetResponseStream()).ReadToEnd());
        Console.WriteLine(response.StatusCode);
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