diff --git a/Cloudflare.Tests/Extensions/StringExtensionsTest.cs b/Cloudflare.Tests/Extensions/StringExtensionsTest.cs
index 3f6428d..b40aac9 100644
--- a/Cloudflare.Tests/Extensions/StringExtensionsTest.cs
+++ b/Cloudflare.Tests/Extensions/StringExtensionsTest.cs
@@ -46,6 +46,21 @@ namespace Cloudflare.Tests.Extensions
 			// Assert - ArgumentOutOfRangeException
 		}
 
+		[DataTestMethod]
+		[DataRow("023e105f4ecef8ad9ca31a8372d0c35")]
+		[DataRow("023e105f4ecef8ad9ca31a8372d0C353")]
+		[DataRow("023e105f4ecef8ad9ca31a8372d0y353")]
+		[ExpectedException(typeof(ArgumentException))]
+		public void ShouldThrowArgumentExceptionForValidateId(string id)
+		{
+			// Arrange
+			
+			// Act
+			id.ValidateCloudflareId();
+
+			// Assert - ArgumentException
+		}
+
 		[TestMethod]
 		public void ShouldValidateName()
 		{
diff --git a/Cloudflare/CloudflareClient.cs b/Cloudflare/CloudflareClient.cs
index 5d553d3..b14c9c3 100644
--- a/Cloudflare/CloudflareClient.cs
+++ b/Cloudflare/CloudflareClient.cs
@@ -198,9 +198,12 @@ namespace AMWD.Net.Api.Cloudflare
 				};
 			}
 
+			// Ensure a clean base URL
+			string baseUrl = _clientOptions.BaseUrl.Trim().TrimEnd('/');
+
 			var client = new HttpClient(handler, true)
 			{
-				BaseAddress = new Uri(_clientOptions.BaseUrl),
+				BaseAddress = new Uri(baseUrl + '/'),
 				Timeout = _clientOptions.Timeout,
 			};
 
@@ -259,6 +262,8 @@ namespace AMWD.Net.Api.Cloudflare
 
 		private string BuildRequestUrl(string requestPath, IQueryParameterFilter? queryFilter = null)
 		{
+			// Ensure a clean request path
+			string reqPath = requestPath.Trim().TrimStart('/');
 			var dict = new Dictionary<string, string>();
 
 			if (_clientOptions.DefaultQueryParams.Count > 0)
@@ -275,12 +280,12 @@ namespace AMWD.Net.Api.Cloudflare
 			}
 
 			if (dict.Count == 0)
-				return requestPath;
+				return reqPath;
 
 			string[] param = dict.Select(kvp => $"{kvp.Key}={WebUtility.UrlEncode(kvp.Value)}").ToArray();
 			string query = string.Join("&", param);
 
-			return $"{requestPath}?{query}";
+			return $"{reqPath}?{query}";
 		}
 
 		private static HttpContent? ConvertRequest<T>(T request)
diff --git a/Cloudflare/Extensions/StringExtensions.cs b/Cloudflare/Extensions/StringExtensions.cs
index 4117bc6..7ace8c7 100644
--- a/Cloudflare/Extensions/StringExtensions.cs
+++ b/Cloudflare/Extensions/StringExtensions.cs
@@ -8,6 +8,7 @@ namespace AMWD.Net.Api.Cloudflare
 	/// </summary>
 	public static class StringExtensions
 	{
+		private static readonly Regex _idCheckRegex = new(@"^[0-9a-f]{32}$", RegexOptions.Compiled);
 		private static readonly Regex _emailCheckRegex = new(@"^[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$", RegexOptions.Compiled);
 
 		/// <summary>
@@ -26,6 +27,13 @@ namespace AMWD.Net.Api.Cloudflare
 
 			if (id.Length > 32)
 				throw new ArgumentOutOfRangeException(nameof(id));
+
+			if (!_idCheckRegex.IsMatch(id))
+				throw new ArgumentException("Invalid Cloudflare ID", nameof(id));
+
+			// TODO: It seems like Cloudflare IDs are GUIDs - should be verified.
+			//if (!Guid.TryParse(id, out _))
+			//	throw new ArgumentException("Invalid Cloudflare ID", nameof(id));
 		}
 
 		/// <summary>