[App Configuration] - Head request support

sdk/appconfiguration/Azure.Data.AppConfiguration/api/Azure.Data.AppConfiguration.net10.0.cs

@@ -39,6 +39,8 @@ public ConfigurationClient(System.Uri endpoint, Azure.Core.TokenCredential crede
         public virtual Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot> ArchiveSnapshot(string snapshotName, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot>> ArchiveSnapshotAsync(string snapshotName, Azure.MatchConditions matchConditions, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot>> ArchiveSnapshotAsync(string snapshotName, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual Azure.Pageable<Azure.Data.AppConfiguration.ConfigurationSetting> CheckConfigurationSettings(Azure.Data.AppConfiguration.SettingSelector selector, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual Azure.AsyncPageable<Azure.Data.AppConfiguration.ConfigurationSetting> CheckConfigurationSettingsAsync(Azure.Data.AppConfiguration.SettingSelector selector, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual Azure.Data.AppConfiguration.CreateSnapshotOperation CreateSnapshot(Azure.WaitUntil wait, string snapshotName, Azure.Data.AppConfiguration.ConfigurationSnapshot snapshot, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Data.AppConfiguration.CreateSnapshotOperation> CreateSnapshotAsync(Azure.WaitUntil wait, string snapshotName, Azure.Data.AppConfiguration.ConfigurationSnapshot snapshot, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual Azure.Response DeleteConfigurationSetting(Azure.Data.AppConfiguration.ConfigurationSetting setting, bool onlyIfUnchanged = false, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }

sdk/appconfiguration/Azure.Data.AppConfiguration/api/Azure.Data.AppConfiguration.net8.0.cs

@@ -39,6 +39,8 @@ public ConfigurationClient(System.Uri endpoint, Azure.Core.TokenCredential crede
         public virtual Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot> ArchiveSnapshot(string snapshotName, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot>> ArchiveSnapshotAsync(string snapshotName, Azure.MatchConditions matchConditions, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot>> ArchiveSnapshotAsync(string snapshotName, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual Azure.Pageable<Azure.Data.AppConfiguration.ConfigurationSetting> CheckConfigurationSettings(Azure.Data.AppConfiguration.SettingSelector selector, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual Azure.AsyncPageable<Azure.Data.AppConfiguration.ConfigurationSetting> CheckConfigurationSettingsAsync(Azure.Data.AppConfiguration.SettingSelector selector, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual Azure.Data.AppConfiguration.CreateSnapshotOperation CreateSnapshot(Azure.WaitUntil wait, string snapshotName, Azure.Data.AppConfiguration.ConfigurationSnapshot snapshot, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Data.AppConfiguration.CreateSnapshotOperation> CreateSnapshotAsync(Azure.WaitUntil wait, string snapshotName, Azure.Data.AppConfiguration.ConfigurationSnapshot snapshot, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual Azure.Response DeleteConfigurationSetting(Azure.Data.AppConfiguration.ConfigurationSetting setting, bool onlyIfUnchanged = false, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }

sdk/appconfiguration/Azure.Data.AppConfiguration/api/Azure.Data.AppConfiguration.netstandard2.0.cs

@@ -39,6 +39,8 @@ public ConfigurationClient(System.Uri endpoint, Azure.Core.TokenCredential crede
         public virtual Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot> ArchiveSnapshot(string snapshotName, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot>> ArchiveSnapshotAsync(string snapshotName, Azure.MatchConditions matchConditions, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Data.AppConfiguration.ConfigurationSnapshot>> ArchiveSnapshotAsync(string snapshotName, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual Azure.Pageable<Azure.Data.AppConfiguration.ConfigurationSetting> CheckConfigurationSettings(Azure.Data.AppConfiguration.SettingSelector selector, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual Azure.AsyncPageable<Azure.Data.AppConfiguration.ConfigurationSetting> CheckConfigurationSettingsAsync(Azure.Data.AppConfiguration.SettingSelector selector, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual Azure.Data.AppConfiguration.CreateSnapshotOperation CreateSnapshot(Azure.WaitUntil wait, string snapshotName, Azure.Data.AppConfiguration.ConfigurationSnapshot snapshot, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task<Azure.Data.AppConfiguration.CreateSnapshotOperation> CreateSnapshotAsync(Azure.WaitUntil wait, string snapshotName, Azure.Data.AppConfiguration.ConfigurationSnapshot snapshot, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual Azure.Response DeleteConfigurationSetting(Azure.Data.AppConfiguration.ConfigurationSetting setting, bool onlyIfUnchanged = false, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }

sdk/appconfiguration/Azure.Data.AppConfiguration/assets.json

@@ -2,5 +2,5 @@
   "AssetsRepo": "Azure/azure-sdk-assets",
   "AssetsRepoPrefixPath": "net",
   "TagPrefix": "net/appconfiguration/Azure.Data.AppConfiguration",
-  "Tag": "net/appconfiguration/Azure.Data.AppConfiguration_0ef5fd0bc3"
+  "Tag": "net/appconfiguration/Azure.Data.AppConfiguration_5393940842"
 }

sdk/appconfiguration/Azure.Data.AppConfiguration/src/ConfigurationClient.cs

@@ -3,10 +3,12 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.Specialized;
 using System.Globalization;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Web;
 using Azure.Core;
 using Azure.Core.Pipeline;
 using Microsoft.TypeSpec.Generator.Customizations;
@@ -751,6 +753,63 @@ HttpMessage NextPageRequest(MatchConditions conditions, int? pageSizeHint, strin
             return new ConditionalPageableImplementation(FirstPageRequest, NextPageRequest, ParseGetConfigurationSettingsResponse, Pipeline, ClientDiagnostics, "ConfigurationClient.GetConfigurationSettings", context);
         }
 
+        /// <summary>
+        /// Checks if one or more <see cref="ConfigurationSetting"/> entities that match the options specified in the passed-in <see cref="SettingSelector"/> have changed.
+        /// </summary>
+        /// <param name="selector">Options used to select a set of <see cref="ConfigurationSetting"/> entities from the configuration store.</param>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> controlling the request lifetime.</param>
+        /// <returns>A pageable collection of pages with empty values collections.</returns>
+        public virtual AsyncPageable<ConfigurationSetting> CheckConfigurationSettingsAsync(SettingSelector selector, CancellationToken cancellationToken = default)
+        {
+            Argument.AssertNotNull(selector, nameof(selector));
+
+            var pageableImplementation = CheckConfigurationSettingsPageableImplementation(selector, cancellationToken);
+
+            return new AsyncConditionalPageable(pageableImplementation);
+        }
+
+        /// <summary>
+        /// Checks if one or more <see cref="ConfigurationSetting"/> entities that match the options specified in the passed-in <see cref="SettingSelector"/> have changed.
+        /// </summary>
+        /// <param name="selector">Set of options for selecting <see cref="ConfigurationSetting"/> from the configuration store.</param>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> controlling the request lifetime.</param>
+        /// <returns>A pageable collection of pages with empty values collections.</returns>
+        public virtual Pageable<ConfigurationSetting> CheckConfigurationSettings(SettingSelector selector, CancellationToken cancellationToken = default)
+        {
+            Argument.AssertNotNull(selector, nameof(selector));
+
+            var pageableImplementation = CheckConfigurationSettingsPageableImplementation(selector, cancellationToken);
+
+            return new ConditionalPageable(pageableImplementation);
+        }
+
+        private ConditionalPageableImplementation CheckConfigurationSettingsPageableImplementation(SettingSelector selector, CancellationToken cancellationToken)
+        {
+            var key = selector.KeyFilter;
+            var label = selector.LabelFilter;
+            var dateTime = selector.AcceptDateTime?.UtcDateTime.ToString(AcceptDateTimeFormat, CultureInfo.InvariantCulture);
+            var tags = selector.TagsFilter;
+
+            RequestContext context = CreateRequestContext(ErrorOptions.Default, cancellationToken);
+            IEnumerable<string> fieldsString = selector.Fields.Split();
+
+            context.AddClassifier(304, false);
+
+            HttpMessage FirstPageRequest(MatchConditions conditions, int? pageSizeHint)
+            {
+                return CreateCheckKeyValuesRequest(key, label, _syncToken, null, dateTime, fieldsString, null, conditions, tags, context);
+            }
+
+            HttpMessage NextPageRequest(MatchConditions conditions, int? pageSizeHint, string nextLink)
+            {
+                HttpMessage message = CreateNextGetConfigurationSettingsRequest(nextLink, key, label, _syncToken, null, dateTime, fieldsString, null, conditions, tags, context);
+                message.Request.Method = RequestMethod.Head;
+                return message;
+            }
+
+            return new ConditionalPageableImplementation(FirstPageRequest, NextPageRequest, ParseCheckConfigurationSettingsResponse, Pipeline, ClientDiagnostics, "ConfigurationClient.CheckConfigurationSettings", context);
+        }
+
         /// <summary>
         /// Retrieves one or more <see cref="ConfigurationSetting"/> entities for snapshots based on name.
         /// </summary>
@@ -1518,6 +1577,22 @@ public virtual void UpdateSyncToken(string token)
             return (values, nextLink);
         }
 
+        private (List<ConfigurationSetting> Values, string NextLink) ParseCheckConfigurationSettingsResponse(Response response)
+        {
+            var values = new List<ConfigurationSetting>();
+            string nextLink = null;
+
+            // The "Link" header is formatted as:
+            // <nextLink>; rel="next"
+            if (response.Headers.TryGetValue("Link", out string linkHeader))
+            {
+                int nextLinkEndIndex = linkHeader.IndexOf('>');
+                nextLink = linkHeader.Substring(1, nextLinkEndIndex - 1);
+            }
+
+            return (values, nextLink);
+        }
+
         private static RequestContext CreateRequestContext(ErrorOptions errorOptions, CancellationToken cancellationToken)
         {
             return new RequestContext()