一切都很好,直到我注意到捆绑的脚本和 CSS 文件返回时带有 cache: no-cache
、expires: -1
和 pragma: no -缓存
header 。
当然,这与Azure无关。为了证明这一点,我通过直接从我的网站而不是 CDN(即 CDN)访问它们来测试这些 bundle 。 mysite.com/bundles/mybundle?v={myassembleversion}。结果是一样的。当我禁用 CDN 并使用 MVC 生成的 v
查询字符串访问捆绑文件时, header 符合预期:公共(public)缓存,有效期为一年。
我尝试实现 IBundleTransform
接口(interface),但是 context.BundleVirtualPath
是只读的(即使它说获取或设置虚拟路径... )。我还尝试修改 Application_EndRequest()
处的响应 header ,但它也不起作用。我的最后一个赌注是编写 IIS 出站规则,但由于我的 bundle (与“自定义”v 查询字符串一起使用)不返回 Last-Modified
header ,所以这也是一次徒劳的尝试。
我的问题是:如果我希望将捆绑的文件缓存在客户端上(即,直到 v
查询字符串发生更改),如何将 MVC 捆绑与 Azure CDN 结合使用?
最佳答案
我知道我有点晚了,但我确实找到了解决方法。我正在使用 Frison B Alexander here 的代码。
问题是,一旦重写 StyleBundles 或 ScriptBundles 的查询字符串,一年的默认缓存行为将重置为无缓存。这是通过为每个包重新生成 MVC 框架在指定每个包的 CDNPath 时使用的完全相同的查询字符串来解决的。
以下是使用 MVC Web 应用程序模板完成此操作的方法。这是 BundleConfig 类:
public class BundleConfig
{
public static void RegisterBundles(BundleCollection bundles)
{
//we have to go ahead and add our Bundles as if there is no CDN involved.
//this is because the bundle has to already exist in the BundleCollection
//in order to get the hash that the MVC framework will generate for the
//querystring.
Bundle jsBundle = new ScriptBundle("~/scripts/js3").Include(
"~/Scripts/jquery-{version}.js",
"~/Scripts/modernizr-*",
"~/Scripts/bootstrap.js",
"~/Scripts/respond.js");
bundles.Add(jsBundle);
Bundle cssBundle = new StyleBundle("~/content/css3").Include(
"~/Content/bootstrap.css",
"~/Content/site.css");
bundles.Add(cssBundle);
#if Debug
bundles.UseCdn = false;
#else
bundles.UseCdn = true;
//grab our base CDN hostname from web.config...
string cdnHost = ConfigurationManager.AppSettings["CDNHostName"];
//get the hashes that the MVC framework will use per bundle for
//the querystring.
string jsHash = GetBundleHash(bundles, "~/scripts/js3");
string cssHash = GetBundleHash(bundles, "~/content/css3");
//set up our querystring per bundle for the CDN path.
jsBundle.CdnPath = cdnHost + "/scripts/js3?v=" + jsHash;
cssBundle.CdnPath = cdnHost + "/content/css3?v=" + cssHash;
#endif
}
//Frison B Alexander's code:
private static string GetBundleHash(BundleCollection bundles, string bundlePath)
{
//Need the context to generate response
var bundleContext = new BundleContext(new HttpContextWrapper(HttpContext.Current), BundleTable.Bundles, bundlePath);
//Bundle class has the method we need to get a BundleResponse
Bundle bundle = BundleTable.Bundles.GetBundleFor(bundlePath);
var bundleResponse = bundle.GenerateBundleResponse(bundleContext);
//BundleResponse has the method we need to call, but its marked as
//internal and therefor is not available for public consumption.
//To bypass this, reflect on it and manually invoke the method
var bundleReflection = bundleResponse.GetType();
var method = bundleReflection.GetMethod("GetContentHashCode", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
//contentHash is whats appended to your url (url?###-###...)
var contentHash = method.Invoke(bundleResponse, null);
return contentHash.ToString();
}
}
关于asp.net-mvc - MVC 5 捆绑和 Azure CDN(查询字符串),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35543576/