@ Url.Content不会解析一台服务器上的绝对路径，但会解析另一台服务器上的绝对路径

Question

目前，我们在同一域上有两台不同的服务器。 但是一台服务器解析

@ Url.Content（ “〜/ API /用户”）”

如

http://domain.com/virtualdirectory/api/User

其他服务器无法完全解决的地方； 而是相对地解决它

API /用户

代码库是相同的，我们正在使用MVC4。 我不确定问题出在哪里，或者是否需要进行任何IIS / DNS设置才能解决此问题。

感谢所有帮助； 谢谢 ：）

Answer 1

这与IIS Web服务器中的IIS重写模块有关，该模块将路径返回到http://domain.com/virtualdirectory/api/User

看一下@ Url.Content的源代码部分：

private static string GenerateClientUrlInternal(HttpContextBase httpContext, string contentPath)
{
     if (String.IsNullOrEmpty(contentPath))
     {
          return contentPath;
     }

     // can't call VirtualPathUtility.IsAppRelative since it throws on some inputs
     bool isAppRelative = contentPath[0] == '~';
     if (isAppRelative)
     {
           string absoluteContentPath = VirtualPathUtility.ToAbsolute(contentPath, httpContext.Request.ApplicationPath);
           return GenerateClientUrlInternal(httpContext, absoluteContentPath);
     }

     // we only want to manipulate the path if URL rewriting is active for this request, else we risk breaking the generated URL
     bool wasRequestRewritten = _urlRewriterHelper.WasRequestRewritten(httpContext);
     if (!wasRequestRewritten)
     {
            return contentPath;
     }

     // Since the rawUrl represents what the user sees in his browser, it is what we want to use as the base
     // of our absolute paths. For example, consider mysite.example.com/foo, which is internally
     // rewritten to content.example.com/mysite/foo. When we want to generate a link to ~/bar, we want to
     // base it from / instead of /foo, otherwise the user ends up seeing mysite.example.com/foo/bar,
     // which is incorrect.
     string relativeUrlToDestination = MakeRelative(httpContext.Request.Path, contentPath);
     string absoluteUrlToDestination = MakeAbsolute(httpContext.Request.RawUrl, relativeUrlToDestination);
     return absoluteUrlToDestination;
}

使用以下代码检查您的Web服务器是否已重写URL：

bool requestWasRewritten = (httpWorkerRequest != null && httpWorkerRequest.GetServerVariable("IIS_WasUrlRewritten") != null);

并且：

private volatile bool _urlRewriterIsTurnedOnCalculated = false;
        private bool _urlRewriterIsTurnedOnValue;
        private object _lockObject = new object();
        private bool IsUrlRewriterTurnedOn(HttpContextBase httpContext)
        {
            // Need to do double-check locking because a single instance of this class is shared in the entire app domain (see PathHelpers)
            if (!_urlRewriterIsTurnedOnCalculated)
            {
                lock (_lockObject)
                {
                    if (!_urlRewriterIsTurnedOnCalculated)
                    {
                        HttpWorkerRequest httpWorkerRequest = (HttpWorkerRequest)httpContext.GetService(typeof(HttpWorkerRequest));
                        //bool urlRewriterIsEnabled = (httpWorkerRequest != null && httpWorkerRequest.GetServerVariable(UrlRewriterEnabledServerVar) != null);
                        bool urlRewriterIsEnabled = (httpWorkerRequest != null && httpWorkerRequest.GetServerVariable("IIS_UrlRewriteModule") != null);

                        _urlRewriterIsTurnedOnValue = urlRewriterIsEnabled;
                        _urlRewriterIsTurnedOnCalculated = true;
                    }
                }
            }
            return _urlRewriterIsTurnedOnValue;
        }

总之，如果requestWasRewrite和IsUrlRewriterTurnedOn都返回true，则意味着您的Web服务器之一已打开IIS Rewrite Module并正在运行，而另一服务器则没有。

有关ASP.NET MVC源代码的更多详细信息，请参考以下链接：

http://aspnetwebstack.codeplex.com/

希望能帮助到你！