Use lower invariant again

Author: JimBobSquarePants

src/ImageSharp.Web/Middleware/ImageSharpMiddlewareOptions.cs

@@ -19,7 +19,7 @@ public class ImageSharpMiddlewareOptions
         private Func<ImageCommandContext, byte[], Task<string>> onComputeHMACAsync = (context, secret) =>
         {
             string uri = CaseHandlingUriBuilder.BuildRelative(
-                 CaseHandlingUriBuilder.CaseHandling.None,
+                 CaseHandlingUriBuilder.CaseHandling.LowerInvariant,
                  context.Context.Request.PathBase,
                  context.Context.Request.Path,
                  QueryString.Create(context.Commands));
@@ -85,7 +85,7 @@ public class ImageSharpMiddlewareOptions
 
         /// <summary>
         /// Gets or sets the method used to compute a Hash-based Message Authentication Code (HMAC) for request authentication.
-        /// Defaults to <see cref="HMACUtilities.ComputeHMACSHA256(string, byte[])"/> using a relative Uri
+        /// Defaults to <see cref="HMACUtilities.ComputeHMACSHA256(string, byte[])"/> using an invariant lowercase relative Uri
         /// generated using <see cref="CaseHandlingUriBuilder.BuildRelative(CaseHandlingUriBuilder.CaseHandling, PathString, PathString, QueryString)"/>.
         /// </summary>
         public Func<ImageCommandContext, byte[], Task<string>> OnComputeHMACAsync

tests/ImageSharp.Web.Tests/TestUtilities/AuthenticatedServerTestBase.cs

@@ -37,8 +37,8 @@ public async Task CanRejectUnauthorizedRequestAsync()
 
         protected override string AugmentCommand(string command)
         {
-            // Mimic the case sensitive url format used by the token and default options.
-            string uri = (this.ImageSource + command).Replace("http://localhost", string.Empty);
+            // Mimic the lowecase relative url format used by the token and default options.
+            string uri = (this.ImageSource + command).Replace("http://localhost", string.Empty).ToLowerInvariant();
             string token = HMACUtilities.ComputeHMACSHA256(uri, AuthenticatedTestServerFixture.HMACSecretKey);
             return command + "&" + HMACUtilities.TokenCommand + "=" + token;
         }