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如何使用C.NET/Mono中的HTTP库来使用请求响应

launchpad networking http .net c#

Manish Sinha · 技术社区 · 16 年前

现在我一直想用 Launchpad's API 用c.net或mono在上面写一个小包装。按照 OAuth ,我首先需要签署请求,然后 Launchpad has it's own way of doing so .

我需要做的是创建一个连接到 https://edge.launchpad.net/+request-token 有一些必要的HTTP头,比如 Content-type . 在python中,我有urllib2,但是当我浏览system.net名称空间时,它让我大吃一惊。我不明白该怎么开始。我是否能用这个有很多困惑 WebRequest , HttpWebRequest 或 WebClient . 使用WebClient,我甚至会得到证书错误,因为它们不会作为可信的添加。

从api文档中,它说需要通过 POST

认证用户密钥:您的用户密钥
OAuth_Signature_方法:字符串“纯文本”
OAuth_签名:字符串“&”。

因此,HTTP请求可能如下所示:

POST /+request-token HTTP/1.1
Host: edge.launchpad.net
Content-type: application/x-www-form-urlencoded

oauth_consumer_key=just+testing&oauth_signature_method=PLAINTEXT&oauth_signature=%26

响应应该如下所示:

200 OK

oauth_token=9kDgVhXlcVn52HGgCWxq&oauth_token_secret=jMth55Zn3pbkPGNht450XHNcHVGTJm9Cqf5ww5HlfxfhEEPKFflMqCXHNVWnj2sWgdPjqDJNRDFlt92f

我修改了很多次代码,最后我能得到的就是

HttpWebRequest clnt = HttpWebRequest.Create(baseAddress) as HttpWebRequest;
// Set the content type
clnt.ContentType =  "application/x-www-form-urlencoded";
clnt.Method = "POST";

string[] listOfData ={
    "oauth_consumer_key="+oauth_consumer_key, 
    "oauth_signature="+oauth_signature, 
    "oauth_signature_method"+oauth_signature_method
};

string postData = string.Join("&",listOfData);
byte[] dataBytes= Encoding.ASCII.GetBytes(postData);

Stream newStream = clnt.GetRequestStream();
newStream.Write(dataBytes,0,dataBytes.Length);

我该如何进一步?我应该打个电话叫读吗 clnt ?

为什么.NET开发人员不能创建一个我们可以用来读写的类,而不是创建数百个类,并混淆每个新成员。

1 回复 | 直到 16 年前

Cheeso 16 年前

不,您需要在获取响应流之前关闭请求流。
像这样:

Stream s= null;
try
{
    s = clnt.GetRequestStream();
    s.Write(dataBytes, 0, dataBytes.Length);
    s.Close();

    // get the response
    try
    {
        HttpWebResponse resp = (HttpWebResponse) req.GetResponse();
        if (resp == null) return null;

        // expected response is a 200 
        if ((int)(resp.StatusCode) != 200)
            throw new Exception(String.Format("unexpected status code ({0})", resp.StatusCode));
        for(int i=0; i < resp.Headers.Count; ++i)  
                ;  //whatever

        var MyStreamReader = new System.IO.StreamReader(resp.GetResponseStream());
        string fullResponse = MyStreamReader.ReadToEnd().Trim();
    }
    catch (Exception ex1)
    {
        // handle 404, 503, etc...here
    }
}    
catch 
{
}

但是如果您不需要所有的控制,您可以更简单地执行WebClient请求。

string address = "https://edge.launchpad.net/+request-token";
string data = "oauth_consumer_key=just+testing&oauth_signature_method=....";
string reply = null;
using (WebClient client = new WebClient ())
{
  client.Headers.Add("Content-Type","application/x-www-form-urlencoded");
  reply = client.UploadString (address, data);
}

完整工作代码(在.NET v3.5中编译):

using System;
using System.Net;
using System.Collections.Generic;
using System.Reflection;

// to allow fast ngen
[assembly: AssemblyTitle("launchpad.cs")]
[assembly: AssemblyDescription("insert purpose here")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("Dino Chiesa")]
[assembly: AssemblyProduct("Tools")]
[assembly: AssemblyCopyright("Copyright Â© Dino Chiesa 2010")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
[assembly: AssemblyVersion("1.1.1.1")]

namespace Cheeso.ToolsAndTests
{
    public class launchpad
    {
        public void Run()
        {
            // see http://tinyurl.com/yfkhwkq
            string address = "https://edge.launchpad.net/+request-token";

            string oauth_consumer_key = "stackoverflow1";
            string oauth_signature_method = "PLAINTEXT";
            string oauth_signature = "%26";

            string[] listOfData ={
                "oauth_consumer_key="+oauth_consumer_key,
                "oauth_signature_method="+oauth_signature_method,
                "oauth_signature="+oauth_signature
            };

            string data = String.Join("&",listOfData);

            string reply = null;
            using (WebClient client = new WebClient ())
            {
                client.Headers.Add("Content-Type","application/x-www-form-urlencoded");
                reply = client.UploadString (address, data);
            }

            System.Console.WriteLine("response: {0}", reply);
        }

        public static void Usage()
        {
            Console.WriteLine("\nlaunchpad: request token from launchpad.net\n");
            Console.WriteLine("Usage:\n  launchpad");
        }


        public static void Main(string[] args)
        {
            try
            {
                new launchpad()
                    .Run();
            }
            catch (System.Exception exc1)
            {
                Console.WriteLine("Exception: {0}", exc1.ToString());
                Usage();
            }
        }
    }
}