google-maps - C# httpwebrequest 与谷歌距离矩阵的浏览器延迟

Question

当我在 .Net 4.0 下发出 GetResponse 时，Windows 7 64bit 的
响应时间约为 30 秒。如果我使用 IE9 或 Firefox 进行相同的调用，响应时间几乎是即时的。C#代码是...

var webRequest = (HttpWebRequest)WebRequest.Create(url);
var objStream = webRequest.GetResponse().GetResponseStream();

两个调用都返回相同的 JSON。

Answer 1

After further testing, it appears that only the first request takes 30 secs. Additional requests in the same session take 1-2 secs, which is still too long. The browser response time is still immediate. Looking for any guidance.