C# HttpRequest.GetUserAgent方法代码示例

		private bool ShouldShowPrerenderedPage(HttpRequest request)
		{
			var userAgent = request.GetUserAgent();

#warning Not sure about this implemetation
			var referer = request.Headers.ContainsKey("Referer") ? request.Headers["Referer"] : string.Empty;

			var url = request.GetFullUrl();

#warning Not sure what this is supposed to do
			if (HasEscapedFragment(request))
			{
				return true;
			}


			if (userAgent.IsEmptyString())
			{
				return false;
			}

			if (!IsSearchRobot(userAgent))
			{
				return false;
			}

			if (IsInResources(url))
			{
				return false;
			}

			var whiteList = options.Whitelist;
			if (whiteList != null && !IsInWhiteList(url, whiteList))
			{
				return false;
			}

			var blacklist = options.Blacklist;
			if (blacklist != null && IsInBlackList(url, referer, blacklist))
			{
				return false;
			}

			return true;

		}

		private ResponseResult GetPrerenderedPageResponse(HttpRequest request)
		{
			var apiUrl = GetApiUrl(request);
			var webRequest = (HttpWebRequest)WebRequest.Create(apiUrl);
			webRequest.Method = "GET";
			webRequest.UserAgent = request.GetUserAgent();

			SetProxy(webRequest);
			SetNoCache(webRequest);

			// Add our key!
			if (options.Token.IsNotEmptyString())
			{
				webRequest.Headers.Add("X-Prerender-Token", options.Token);
			}

			try
			{
				// Get the web response and read content etc. if successful
				var webResponse = (HttpWebResponse)webRequest.GetResponse();

				using (var reader = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8))
				{
					return new ResponseResult(webResponse.StatusCode, reader.ReadToEnd(), webResponse.Headers);
				}
			}
			catch (WebException e)
			{
				// Handle response WebExceptions for invalid renders (404s, 504s etc.) - but we still want the content
				using (var reader = new StreamReader(e.Response.GetResponseStream(), Encoding.UTF8))
				{
					return new ResponseResult(((HttpWebResponse)e.Response).StatusCode, reader.ReadToEnd(), e.Response.Headers);
				}
			}
		}