Implemented PATCH as defined in .NET 6.0 for .NET Standard 2.0

Cloudflare/Extensions/HttpClientExtensions.cs

@@ -0,0 +1,53 @@
+#if ! NET6_0_OR_GREATER
+
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace System.Net.Http
+{
+	/// <summary>
+	/// Extension methods for <see cref="HttpClient"/>s.
+	/// </summary>
+	/// <remarks>
+	/// Copied from <see href="https://github.com/dotnet/runtime/blob/v6.0.0/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs">.NET 6 runtime / HttpClient</see>.
+	/// </remarks>
+	[Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+	internal static class HttpClientExtensions
+	{
+		private static readonly HttpMethod _httpMethodPatch = new("PATCH");
+
+		/// <summary>
+		/// Sends a PATCH request with a cancellation token to a Uri represented as a string as an asynchronous operation.
+		/// </summary>
+		/// <param name="client">A <see cref="HttpClient"/> instance.</param>
+		/// <param name="requestUri">The Uri the request is sent to.</param>
+		/// <param name="content">The HTTP request content sent to the server.</param>
+		/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
+		/// <returns>The task object representing the asynchronous operation.</returns>
+		public static Task<HttpResponseMessage> PatchAsync(this HttpClient client, string? requestUri, HttpContent? content, CancellationToken cancellationToken) =>
+			client.PatchAsync(CreateUri(requestUri), content, cancellationToken);
+
+		/// <summary>
+		/// Sends a PATCH request with a cancellation token as an asynchronous operation.
+		/// </summary>
+		/// <param name="client">A <see cref="HttpClient"/> instance.</param>
+		/// <param name="requestUri">The Uri the request is sent to.</param>
+		/// <param name="content">The HTTP request content sent to the server.</param>
+		/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
+		/// <returns>The task object representing the asynchrnous operation.</returns>
+		public static Task<HttpResponseMessage> PatchAsync(this HttpClient client, Uri? requestUri, HttpContent? content, CancellationToken cancellationToken)
+		{
+			var request = new HttpRequestMessage(_httpMethodPatch, requestUri)
+			{
+				Version = HttpVersion.Version11,
+				Content = content,
+			};
+			return client.SendAsync(request, cancellationToken);
+		}
+
+		private static Uri? CreateUri(string? uri) =>
+			string.IsNullOrEmpty(uri) ? null : new Uri(uri, UriKind.RelativeOrAbsolute);
+	}
+}
+
+#endif