Gzip - fix good and bad examples (#8206)

rules/do-you-use-gzip/rule.md

@@ -49,59 +49,53 @@ Refer to [Improve the Performance of ASP.NET MVC Web Application Using HTTP Comp
 
 To implement this in ASP.NET MVC, we can utilize `ActionFilterAttribute` and override either `OnActionExecuting` or `OnResultExecuting` method. The below code snippet is being used to check whether the current request browser can accept GZIP/DEFLATE encoding by looking at Accept-Encoding request header. If it finds GZIP encoding in this header, then we would set gzip in Content-encoding in response header and if it supports DEFLATE, then this code would set deflate in Content-encoding.
 
-  ```csharp
-  using System;
-  using System.Collections.Generic;
-  using System.IO.Compression;
-  using System.Linq;
-  using System.Web;
-  using System.Web.Mvc;
-
-  namespace HTTPCompression.ActionFilters
-  {
-      public class CompressAttribute : ActionFilterAttribute
-      {
-          public override void OnResultExecuting(ResultExecutingContext
-          filterContext)
-          {
-            HttpRequestBase request = filterContext.HttpContext.Request;
-
-            string acceptEncoding = request.Headers["Accept-Encoding"];
-
-            if (string.IsNullOrEmpty(acceptEncoding)) return;
-
-            acceptEncoding = acceptEncoding.ToUpperInvariant();
-
-            HttpResponseBase response = filterContext.HttpContext.Response;
-
-            if (acceptEncoding.Contains("GZIP"))
-            {
-                response.AppendHeader("Content-encoding", "gzip");
-                response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
-            }
-            else if (acceptEncoding.Contains("DEFLATE"))
-            {
-                response.AppendHeader("Content-encoding", "deflate");
-                response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
-            }
+```csharp
+using System;
+using System.IO.Compression;
+using System.Web.Mvc;
+
+namespace HTTPCompression.ActionFilters;
+
+public class CompressAttribute : ActionFilterAttribute
+{
+    public override void OnResultExecuting(ResultExecutingContext filterContext)
+    {
+        HttpRequestBase request = filterContext.HttpContext.Request;
+        string acceptEncoding = request.Headers["Accept-Encoding"];
+
+        if (string.IsNullOrEmpty(acceptEncoding)) return;
+
+        acceptEncoding = acceptEncoding.ToUpperInvariant();
+        HttpResponseBase response = filterContext.HttpContext.Response;
+
+        if (acceptEncoding.Contains("GZIP"))
+        {
+            response.AppendHeader("Content-encoding", "gzip");
+            response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
+        }
+        else if (acceptEncoding.Contains("DEFLATE"))
+        {
+            response.AppendHeader("Content-encoding", "deflate");
+            response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
         }
     }
-  }
-  ```
-
-  ```csharp
-  [Compress] 
-   public ActionResult About() 
-   { 
-      ViewBag.Message = "Your application description"; 
-      return View(); 
-   }
-  ```
-
-  ::: bad
-  Figure: Bad example - Files with large size and slow load time
-  :::
-
-  ::: good
-  ![Figure: Good example - Gzipped files with smaller size and faster load time](5.28.7.png)
-  :::
+}
+
+```
+
+```csharp
+[Compress] 
+public ActionResult About() 
+{ 
+   ViewBag.Message = "Your application description"; 
+   return View(); 
+}
+```
+
+::: bad
+Figure: Bad example - Files with large size and slow load time
+:::
+
+::: good
+![Figure: Good example - Gzipped files with smaller size and faster load time](5.28.7.png)
+:::