如何检查文件是否在其网址的web服务器的存在？ [英] How to check if a file exists on an webserver by its URL?

问题描述

在我们的应用中有某种联机帮助。它的工作原理很简单：如果用户点击帮助按钮的URL是构建依赖于当前的语言和帮助上下文（如http://example.com/help/+ [LANG_ID] +[HELP_CONTEXT]）和。所谓的浏览器中的

in our application we have some kind of online help. It works really simple: If the user clicks on the help button a URL is build depending on the current language and help context (e.g. "http://example.com/help/" + [LANG_ID] + "[HELP_CONTEXT]) and called within the browser.

所以我的问题是：我如何检查文件是否在Web服务器上存在而不加载完整的文件内容

So my question is: How can i check if a file exists on the web server without loading the complete file content?

感谢您的帮助

更新！。感谢您的帮助我的问题已经回答了
现在我们有代理认证问题的一个不能发送HTTP请求;）

推荐答案

您可以使用.NET做。HEAD请求，然后看一下响应的状态

You can use .NET to do a HEAD request and then look at the status of the response.

您的代码将是这个样子（改编自的弱旅HTTP HEAD请求）：

Your code would look something like this (adapted from The Lowly HTTP HEAD Request):

// create the request
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;

// instruct the server to return headers only
request.Method = "HEAD";

// make the connection
HttpWebResponse response = request.GetResponse() as HttpWebResponse;

// get the status code
HttpStatusCode status = response.StatusCode;

下面是详细介绍了的 的状态代码可以通过枚举的StatusCode返回。

Here's a list detailing the status codes that can be returned by the StatusCode enumerator.

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