為什么不用FiddlerCore？

說到FiddlerCore大家可能會比較陌生，那么它哥Fiddler就比較熟悉了；抓包、模擬低帶寬、修改請求我平時比較常用。Fiddler的本質就是一個HTTP代理服務器。
FiddlerCore是Fiddler去除了UI的核心組件，可以用于二次開發。如下圖所示：

Fiddler主要有以下幾點感覺很別扭：

API命名不規范、屬性/字段混用。
.NET中普遍采用Pascal命名規范，而Fiddler的命名就像個大雜燴。例如：public成員用字段，CONFIG類名，oSession參數名

不支持異步。所有的回調都是同步。

框架設計不合理，不支持多實例，大量使用了靜態方法。所有方法都堆到了Session類中不易于擴展，起碼Request/Response也得分開啊。

單就以上幾點我感覺這框架完全沒有設計可言，如果沒有別的選擇FiddlerCore我或許就將就用了，好在Github上已經有人先一步重新實現了FiddlerCore

Titanium-Web-Proxy介紹

一個跨平臺、輕量級、低內存、高性能的HTTP(S)代理服務器，開發語言為C#

https://github.com/justcoding121/Titanium-Web-Proxy

功能特性

支持HTTP(S)與HTTP 1.1的大部分功能

支持redirect/block/update 請求

支持更新Response

支持HTTP承載的WebSocket

Support mutual SSL authentication

完全異步的代理

支持代理授權與自動代理檢測

Kerberos/NTLM authentication over HTTP protocols for windows domain

使用

安裝NuGet包

Install-Package Titanium.Web.Proxy

支持

• .Net Standard 1.6或更高
• .Net Framework 4.5或更高

設置HTTP代理

var proxyServer = new ProxyServer();//locally trust root certificate used by this proxy proxyServer.TrustRootCertificate = true;//optionally set the Certificate Engine //Under Mono only BouncyCastle will be supported //proxyServer.CertificateEngine = Network.CertificateEngine.BouncyCastle;proxyServer.BeforeRequest += OnRequest; proxyServer.BeforeResponse += OnResponse; proxyServer.ServerCertificateValidationCallback += OnCertificateValidation; proxyServer.ClientCertificateSelectionCallback += OnCertificateSelection;var explicitEndPoint = new ExplicitProxyEndPoint(IPAddress.Any, 8000, true) { //Exclude HTTPS addresses you don't want to proxy //Useful for clients that use certificate pinning //for example dropbox.com // ExcludedHttpsHostNameRegex = new List<string>() { "google.com", "dropbox.com" }//Use self-issued generic certificate on all HTTPS requests //Optimizes performance by not creating a certificate for each HTTPS-enabled domain //Useful when certificate trust is not required by proxy clients // GenericCertificate = new X509Certificate2(Path.Combine(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location), "genericcert.pfx"), "password") };//An explicit endpoint is where the client knows about the existence of a proxy //So client sends request in a proxy friendly manner proxyServer.AddEndPoint(explicitEndPoint); proxyServer.Start();//Transparent endpoint is useful for reverse proxy (client is not aware of the existence of proxy) //A transparent endpoint usually requires a network router port forwarding HTTP(S) packets or DNS //to send data to this endPoint var transparentEndPoint = new TransparentProxyEndPoint(IPAddress.Any, 8001, true) {//Generic Certificate hostname to use//when SNI is disabled by clientGenericCertificateName = "google.com" };proxyServer.AddEndPoint(transparentEndPoint);//proxyServer.UpStreamHttpProxy = new ExternalProxy() { HostName = "localhost", Port = 8888 }; //proxyServer.UpStreamHttpsProxy = new ExternalProxy() { HostName = "localhost", Port = 8888 };foreach (var endPoint in proxyServer.ProxyEndPoints) Console.WriteLine("Listening on '{0}' endpoint at Ip {1} and port: {2} ",endPoint.GetType().Name, endPoint.IpAddress, endPoint.Port);//Only explicit proxies can be set as system proxy! proxyServer.SetAsSystemHttpProxy(explicitEndPoint); proxyServer.SetAsSystemHttpsProxy(explicitEndPoint);//wait here (You can use something else as a wait function, I am using this as a demo) Console.Read();//Unsubscribe & Quit proxyServer.BeforeRequest -= OnRequest; proxyServer.BeforeResponse -= OnResponse; proxyServer.ServerCertificateValidationCallback -= OnCertificateValidation; proxyServer.ClientCertificateSelectionCallback -= OnCertificateSelection;proxyServer.Stop();

簡單的請求與響應處理

//To access requestBody from OnResponse handler private IDictionary<Guid, string> requestBodyHistory = new ConcurrentDictionary<Guid, string>();public async Task OnRequest(object sender, SessionEventArgs e) {Console.WriteLine(e.WebSession.Request.Url);read request headersvar requestHeaders = e.WebSession.Request.RequestHeaders;var method = e.WebSession.Request.Method.ToUpper();if ((method == "POST" || method == "PUT" || method == "PATCH")){//Get/Set request body bytesbyte[] bodyBytes = await e.GetRequestBody();await e.SetRequestBody(bodyBytes);//Get/Set request body as stringstring bodyString = await e.GetRequestBodyAsString();await e.SetRequestBodyString(bodyString);//store request Body/request headers etc with request Id as key//so that you can find it from response handler using request IdrequestBodyHistory[e.Id] = bodyString;}//To cancel a request with a custom HTML content//Filter URLif (e.WebSession.Request.RequestUri.AbsoluteUri.Contains("google.com")){await e.Ok("<!DOCTYPE html>" +"<html><body><h1>" +"Website Blocked" +"</h1>" +"<p>Blocked by titanium web proxy.</p>" +"</body>" +"</html>");}//Redirect exampleif (e.WebSession.Request.RequestUri.AbsoluteUri.Contains("wikipedia.org")){await e.Redirect("https://www.paypal.com");} }//Modify response public async Task OnResponse(object sender, SessionEventArgs e) {//read response headersvar responseHeaders = e.WebSession.Response.ResponseHeaders;//if (!e.ProxySession.Request.Host.Equals("medeczane.sgk.gov.tr")) return;if (e.WebSession.Request.Method == "GET" || e.WebSession.Request.Method == "POST"){if (e.WebSession.Response.ResponseStatusCode == "200"){if (e.WebSession.Response.ContentType!=null && e.WebSession.Response.ContentType.Trim().ToLower().Contains("text/html")){byte[] bodyBytes = await e.GetResponseBody();await e.SetResponseBody(bodyBytes);string body = await e.GetResponseBodyAsString();await e.SetResponseBodyString(body);}}}//access request body/request headers etc by looking up using requestIdif(requestBodyHistory.ContainsKey(e.Id)){var requestBody = requestBodyHistory[e.Id];} }/// Allows overriding default certificate validation logic public Task OnCertificateValidation(object sender, CertificateValidationEventArgs e) {//set IsValid to true/false based on Certificate Errorsif (e.SslPolicyErrors == System.Net.Security.SslPolicyErrors.None)e.IsValid = true;return Task.FromResult(0); }/// Allows overriding default client certificate selection logic during mutual authentication public Task OnCertificateSelection(object sender, CertificateSelectionEventArgs e) {//set e.clientCertificate to overridereturn Task.FromResult(0); }

未來路線圖

• 支持HTTP 2.0
• 支持Socks協議

總結

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