使用TcpClient创建http请求
我创建了一个空的asp.net Web应用程序，我有一个简单的aspx页面：
protected void Page_Load(object sender, EventArgs e) { Response.Write("Hello world"); } 当我转到http://localhost:2006/1.aspx我看到一个页面上写着“Hello world”。
好吧，如果我这样做的话＃：
WebClient webClient = new WebClient() { Proxy = null }; var response2 = webClient.DownloadString("http://localhost:2006/1.aspx");
那么response2 ==“Hello world”
我需要使用原始tcp连接实现相同的function
我试图用tcp连接实现同样的事情，由于某种原因它不起作用：
byte[] buf = new byte[1024]; string header = "GET http://localhost:2006/1.aspx HTTP/1.1\r\n" + "Host: localhost:2006\r\n" + "Connection: keep-alive\r\n" + "User-Agent: Mozilla/5.0\r\n" + "\r\n"; var client = new TcpClient("localhost", 2006); // send request client.Client.Send(System.Text.Encoding.ASCII.GetBytes(header)); // get response var i = client.Client.Receive(buf); var response1 = System.Text.Encoding.UTF8.GetString(buf, 0, i);
这里response1！=“Hello Wold”。 （注意我用！=意思不相等）
在这个例子中，我得到一个错误的请求错误。
我想使用tcp连接进行学习。 我不明白为什么第二个例子不起作用。 我的第一反应可能是标题不正确所以我做的是我启动wireshark以查看我的chrom浏览器发送的标题。 事实上，当我转到http://localhost:2006/1.aspx时，我的浏览器发送的实际请求是：
GET http://localhost:2006/1.aspx HTTP/1.1 Host: localhost:2006 Connection: keep-alive Cache-Control: max-age=0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8
我也尝试过使用该请求，当我这样做时，我也收到了错误的请求响应！ 为什么？
换句话说，我已经取代了
string header = "GET http://localhost:2006/1.aspx HTTP/1.1\r\n" + "Host: localhost:2006\r\n" + "Connection: keep-alive\r\n" + "User-Agent: Mozilla/5.0\r\n" + "\r\n";
对于
string header = "GET http://localhost:2006/1.aspx HTTP/1.1\r\n" + "Host: localhost:2006\r\n" + "Connection: keep-alive\r\n" + "Cache-Control: max-age=0\r\n" + "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\n" + "User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36\r\n" + "Accept-Encoding: gzip,deflate,sdch\r\n" + "Accept-Language: en-US,en;q=0.8" + "\r\n\r\n";
它仍然无法正常工作。
这是我的版本。 工作良好
private static async Task HttpRequestAsync() { string result = string.Empty; using (var tcp = new TcpClient("www.bing.com", 80)) using (var stream = tcp.GetStream()) { tcp.SendTimeout = 500; tcp.ReceiveTimeout = 1000; // Send request headers var builder = new StringBuilder(); builder.AppendLine("GET /?scope=images&nr=1 HTTP/1.1"); builder.AppendLine("Host: www.bing.com"); //builder.AppendLine("Content-Length: " + data.Length); // only for POST request builder.AppendLine("Connection: close"); builder.AppendLine(); var header = Encoding.ASCII.GetBytes(builder.ToString()); await stream.WriteAsync(header, 0, header.Length); // Send payload data if you are POST request //await stream.WriteAsync(data, 0, data.Length); // receive data using (var memory = new MemoryStream()) { await stream.CopyToAsync(memory); memory.Position = 0; var data = memory.ToArray(); var index = BinaryMatch(data, Encoding.ASCII.GetBytes("\r\n\r\n")) + 4; var headers = Encoding.ASCII.GetString(data, 0, index); memory.Position = index; if (headers.IndexOf("Content-Encoding: gzip") > 0) { using (GZipStream decompressionStream = new GZipStream(memory, CompressionMode.Decompress)) using (var decompressedMemory = new MemoryStream()) { decompressionStream.CopyTo(decompressedMemory); decompressedMemory.Position = 0; result = Encoding.UTF8.GetString(decompressedMemory.ToArray()); } } else { result = Encoding.UTF8.GetString(data, index, data.Length - index); //result = Encoding.GetEncoding("gbk").GetString(data, index, data.Length - index); } } //Debug.WriteLine(result); return result; } } private static int BinaryMatch(byte[] input, byte[] pattern) { int sLen = input.Length - pattern.Length + 1; for (int i = 0; i < sLen; ++i) { bool match = true; for (int j = 0; j < pattern.Length; ++j) { if (input[i + j] != pattern[j]) { match = false; break; } } if (match) { return i; } } return -1; }