Titanium Web 代理 - 无法修改请求正文

Question

我在使用 Titanium Web 代理时遇到问题。我想要的是在将某些网站加载到浏览器之前更改它们的内容。我已经实施了一切并且工作正常，减去了不断变化的内容部分。这是代码的一部分：

        public async Task OnRequest(object sender, SessionEventArgs e)
    {
        //Console.WriteLine(e.HttpClient.Request.Url);

        // read request headers
        var requestHeaders = e.HttpClient.Request.Headers;

        var method = e.HttpClient.Request.Method.ToUpper();
        if ((method == "POST" || method == "PUT" || method == "PATCH"))
        {
            // Get/Set request body bytes
            byte[] bodyBytes = await e.GetRequestBody();
            await Task.Run(() => e.SetRequestBody(bodyBytes));

            // Get/Set request body as string
            string bodyString = await e.GetRequestBodyAsString();
            await Task.Run(() => e.SetRequestBodyString(bodyString));

            // store request 
            // so that you can find it from response handler 
            e.UserData = e.HttpClient.Request;
        }

        if(e.HttpClient.Request.RequestUri.AbsoluteUri.Contains("websiteiwanttochange"))
        {
            byte[] bodyBytes = await e.GetResponseBody();
            e.SetRequestBody(bodyBytes);
            string bodyString = await e.GetResponseBodyAsString();
            e.SetRequestBodyString(bodyString);
            e.UserData = e.WebSession.Request;

            Console.WriteLine("\n\n\n\n\n\n\nTesting\n\n\n\n\n\n");
            Console.WriteLine(bodyBytes.ToString());
            //Console.WriteLine(bodyString);
        }

        // To cancel a request with a custom HTML content
        // Filter URL
        if (e.HttpClient.Request.RequestUri.AbsoluteUri.Contains("google.com"))
        {
            e.Ok("<!DOCTYPE html>" +
                "<html><body><h1>" +
                "Website Blocked" +
                "</h1>" +
                "<p>Blocked by titanium web proxy.</p>" +
                "</body>" +
                "</html>");
        }

        // Redirect example
        if (e.HttpClient.Request.RequestUri.AbsoluteUri.Contains("wikipedia.org"))
        {
            e.Redirect("https://www.paypal.com");
        }
    }

这几乎就是我从 Titanium Web Proxy Github 获得的示例。但是，尽管此代码可以正确加载网站，但它永远不会到达“\n\n\n\n\n\n\nTesting\n\n\n\n\n\n”。

我已经尝试为该网站添加阻止，就像为 google 一样，它工作正常并阻止它。

有谁知道可能是什么问题？我坚持了一段时间，所以任何帮助将不胜感激。

这个例子没有实现内容的改变，我只是想把内容看成字符串，然后尝试改变它。

Answer 1

如果我没理解错的话，你想在浏览器获取之前修改从远程服务器收到的响应。挂钩的正确位置是 OnBeforeResponse 事件。这是一个示例代码，我将响应的主体从 http://example.com:

更改为

void Main()
{
    var proxyServer = new ProxyServer(userTrustRootCertificate: false);

    proxyServer.BeforeResponse += OnBeforeResponse;

    var httpProxy = new ExplicitProxyEndPoint(IPAddress.Loopback, 8080, decryptSsl: true);

    proxyServer.AddEndPoint(httpProxy);
    proxyServer.Start();

    Console.ReadLine();

    proxyServer.BeforeResponse -= OnBeforeResponse;
    proxyServer.Stop();
}

public async Task OnBeforeResponse(object sender, SessionEventArgs ev)
{
    var request = ev.HttpClient.Request;
    var response = ev.HttpClient.Response;

    if (String.Equals(ev.HttpClient.Request.RequestUri.Host, "www.example.com", StringComparison.OrdinalIgnoreCase)) {
        var body = await ev.GetResponseBodyAsString();
        
        body = body.Replace("<title>Example Domain</title>", "<title>My Example Domain</title>");
        
        ev.SetResponseBodyString(body);
    }
}

并测试：

$ curl.exe --proxy http://localhost:8080 http://www.example.com
<!doctype html>
<html>
<head>
    <title>My Example Domain</title>

... stripped ...

Titanium Web 代理 - 无法修改请求正文

Titanium Web Proxy - Can't modify request body

c#

selenium

proxy

titanium-web-proxy