void app_BeginRequest(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
if (app.Request.Path == "/" && app.Request.QueryString["target"] == "clear")
{
RemoveProxySiteCookie(app.Response);
app.Response.Redirect("/");
return;
}
string destRoot = GetProxySiteFromCookie(app);
if (string.IsNullOrEmpty(destRoot))
{
return;
}
string destUrl = destRoot + app.Request.RawUrl;
string srcUrl = app.Request.Url.AbsoluteUri;
HttpProxyHandler hander = new HttpProxyHandler(srcUrl, destUrl);
app.Context.RemapHandler(hander);
app.Context.Response.Headers.Add("X-CookieProxyModule", destUrl); // 用于调试诊断
}
private void App_BeginRequest(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
// 尝试从配置规则中获取目标站点地址
string destRoot = GetProxySite(app);
// 如果没有匹配项，则表示从当前站点中处理
if (string.IsNullOrEmpty(destRoot))
{
return;
}
// 计算用转发的实际网址
string destUrl = destRoot + app.Request.RawUrl;
string srcUrl = app.Request.Url.AbsoluteUri;
HttpProxyHandler hander = new HttpProxyHandler(srcUrl, destUrl);
app.Context.RemapHandler(hander);
app.Context.Response.Headers.Add("X-HttpProxyModule", destUrl); // 用于调试诊断
// 既然转发了请求，就不用当前站点的身份认证了
app.Context.SkipAuthorization = true;
}
/// <summary>
/// 以异步方式执行HttpHanlder（基类方法重写）
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public async override Task ProcessRequestAsync(HttpContext context)
{
string destUrl = GetTransferTarget(context);
if (string.IsNullOrEmpty(destUrl))
{
throw new ArgumentNullException("destUrl");
}
string srcUrl = context.Request.Url.AbsoluteUri;
context.Response.Headers.Add("X-ProxyTransferHandler", destUrl); // 用于调试诊断
HttpProxyHandler hander = new HttpProxyHandler(srcUrl, destUrl);
await hander.ProcessRequestAsync(context);
}
