diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/BasicHtmlWebResponseObject.Common.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/BasicHtmlWebResponseObject.Common.cs
index 8eaa95c224a..75775428bc9 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/BasicHtmlWebResponseObject.Common.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/BasicHtmlWebResponseObject.Common.cs
@@ -1,8 +1,11 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Management.Automation;
 using System.Net.Http;
@@ -33,7 +36,7 @@ public BasicHtmlWebResponseObject(HttpResponseMessage response, CancellationToke
         /// <param name="response">The response.</param>
         /// <param name="contentStream">The content stream associated with the response.</param>
         /// <param name="cancellationToken">Cancellation token.</param>
-        public BasicHtmlWebResponseObject(HttpResponseMessage response, Stream contentStream, CancellationToken cancellationToken) : base(response, contentStream, cancellationToken)
+        public BasicHtmlWebResponseObject(HttpResponseMessage response, Stream? contentStream, CancellationToken cancellationToken) : base(response, contentStream, cancellationToken)
         {
             InitializeContent(cancellationToken);
             InitializeRawContent(response);
@@ -60,9 +63,9 @@ public BasicHtmlWebResponseObject(HttpResponseMessage response, Stream contentSt
         /// Encoding of the response body from the <c>Content-Type</c> header,
         /// or <see langword="null"/> if the encoding could not be determined.
         /// </value>
-        public Encoding Encoding { get; private set; }
+        public Encoding? Encoding { get; private set; }
 
-        private WebCmdletElementCollection _inputFields;
+        private WebCmdletElementCollection? _inputFields;
 
         /// <summary>
         /// Gets the HTML input field elements parsed from <see cref="Content"/>.
@@ -87,7 +90,7 @@ public WebCmdletElementCollection InputFields
             }
         }
 
-        private WebCmdletElementCollection _links;
+        private WebCmdletElementCollection? _links;
 
         /// <summary>
         /// Gets the HTML a link elements parsed from <see cref="Content"/>.
@@ -112,7 +115,7 @@ public WebCmdletElementCollection Links
             }
         }
 
-        private WebCmdletElementCollection _images;
+        private WebCmdletElementCollection? _images;
 
         /// <summary>
         /// Gets the HTML img elements parsed from <see cref="Content"/>.
@@ -145,13 +148,14 @@ public WebCmdletElementCollection Images
         /// Reads the response content from the web response.
         /// </summary>
         /// <param name="cancellationToken">The cancellation token.</param>
+        [MemberNotNull(nameof(Content))]
         protected void InitializeContent(CancellationToken cancellationToken)
         {
-            string contentType = ContentHelper.GetContentType(BaseResponse);
+            string? contentType = ContentHelper.GetContentType(BaseResponse);
             if (ContentHelper.IsText(contentType))
             {
                 // Fill the Content buffer
-                string characterSet = WebResponseHelper.GetCharacterSet(BaseResponse);
+                string? characterSet = WebResponseHelper.GetCharacterSet(BaseResponse);
 
                 Content = StreamHelper.DecodeStream(RawContentStream, characterSet, out Encoding encoding, cancellationToken);
                 Encoding = encoding;
@@ -204,7 +208,7 @@ private static void ParseAttributes(string outerHtml, PSObject elementObject)
                     string name = nvMatches.Groups[1].Value;
 
                     // The value (if any) is captured by group #2, #3, or #4, depending on quoting or lack thereof
-                    string value = null;
+                    string? value = null;
                     if (nvMatches.Groups[2].Success)
                     {
                         value = nvMatches.Groups[2].Value;
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/ContentHelper.Common.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/ContentHelper.Common.cs
index bf127967ffe..bb31366f794 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/ContentHelper.Common.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/ContentHelper.Common.cs
@@ -1,7 +1,10 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.Management.Automation;
 using System.Net.Http;
 using System.Net.Http.Headers;
@@ -16,7 +19,7 @@ internal static class ContentHelper
         #region Internal Methods
 
         // ContentType may not exist in response header.  Return null if not.
-        internal static string GetContentType(HttpResponseMessage response) => response.Content.Headers.ContentType?.MediaType;
+        internal static string? GetContentType(HttpResponseMessage response) => response.Content.Headers.ContentType?.MediaType;
 
         internal static Encoding GetDefaultEncoding() => Encoding.UTF8;
 
@@ -35,7 +38,7 @@ internal static StringBuilder GetRawContentHeader(HttpResponseMessage response)
             HttpHeaders[] headerCollections =
             {
                 response.Headers,
-                response.Content?.Headers
+                response.Content.Headers
             };
 
             foreach (var headerCollection in headerCollections)
@@ -59,7 +62,7 @@ internal static StringBuilder GetRawContentHeader(HttpResponseMessage response)
             return raw;
         }
 
-        internal static bool IsJson(string contentType)
+        internal static bool IsJson([NotNullWhen(true)] string? contentType)
         {
             if (string.IsNullOrEmpty(contentType))
             {
@@ -80,7 +83,7 @@ internal static bool IsJson(string contentType)
             return isJson;
         }
 
-        internal static bool IsText(string contentType)
+        internal static bool IsText([NotNullWhen(true)] string? contentType)
         {
             if (string.IsNullOrEmpty(contentType))
             {
@@ -96,19 +99,18 @@ internal static bool IsText(string contentType)
             if (Platform.IsWindows && !isText)
             {
                 // Media types registered with Windows as having a perceived type of text, are text
-                using (RegistryKey contentTypeKey = Registry.ClassesRoot.OpenSubKey(@"MIME\Database\Content Type\" + contentType))
+                using (RegistryKey? contentTypeKey = Registry.ClassesRoot.OpenSubKey(@"MIME\Database\Content Type\" + contentType))
                 {
                     if (contentTypeKey != null)
                     {
-                        string extension = contentTypeKey.GetValue("Extension") as string;
-                        if (extension != null)
+                        if (contentTypeKey.GetValue("Extension") is string extension)
                         {
-                            using (RegistryKey extensionKey = Registry.ClassesRoot.OpenSubKey(extension))
+                            using (RegistryKey? extensionKey = Registry.ClassesRoot.OpenSubKey(extension))
                             {
                                 if (extensionKey != null)
                                 {
-                                    string perceivedType = extensionKey.GetValue("PerceivedType") as string;
-                                    isText = (perceivedType == "text");
+                                    string? perceivedType = extensionKey.GetValue("PerceivedType") as string;
+                                    isText = perceivedType == "text";
                                 }
                             }
                         }
@@ -119,7 +121,7 @@ internal static bool IsText(string contentType)
             return isText;
         }
 
-        internal static bool IsXml(string contentType)
+        internal static bool IsXml([NotNullWhen(true)] string? contentType)
         {
             if (string.IsNullOrEmpty(contentType))
             {
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/InvokeRestMethodCommand.Common.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/InvokeRestMethodCommand.Common.cs
index 3fe6e2a91ad..a0ec902fb96 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/InvokeRestMethodCommand.Common.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/InvokeRestMethodCommand.Common.cs
@@ -1,7 +1,10 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Management.Automation;
 using System.Net.Http;
@@ -56,13 +59,13 @@ public int MaximumFollowRelLink
         /// </summary>
         [Parameter]
         [Alias("RHV")]
-        public string ResponseHeadersVariable { get; set; }
+        public string? ResponseHeadersVariable { get; set; }
 
         /// <summary>
         /// Gets or sets the variable name to use for storing the status code from the response.
         /// </summary>
         [Parameter]
-        public string StatusCodeVariable { get; set; }
+        public string? StatusCodeVariable { get; set; }
 
         #endregion Parameters
 
@@ -95,12 +98,12 @@ internal override void ProcessResponse(HttpResponseMessage response)
                     RestReturnType returnType = CheckReturnType(response);
 
                     // Try to get the response encoding from the ContentType header.
-                    string charSet = WebResponseHelper.GetCharacterSet(response);
+                    string? characterSet = WebResponseHelper.GetCharacterSet(response);
 
-                    string str = StreamHelper.DecodeStream(responseStream, charSet, out Encoding encoding, _cancelToken.Token);
+                    string str = StreamHelper.DecodeStream(responseStream, characterSet, out Encoding encoding, _cancelToken.Token);
 
-                    object obj = null;
-                    Exception ex = null;
+                    object? obj = null;
+                    Exception? ex = null;
 
                     string encodingVerboseName;
                     try
@@ -167,7 +170,7 @@ private static RestReturnType CheckReturnType(HttpResponseMessage response)
             ArgumentNullException.ThrowIfNull(response);
 
             RestReturnType rt = RestReturnType.Detect;
-            string contentType = ContentHelper.GetContentType(response);
+            string? contentType = ContentHelper.GetContentType(response);
             if (string.IsNullOrEmpty(contentType))
             {
                 rt = RestReturnType.Detect;
@@ -223,7 +226,7 @@ private bool TryProcessFeedStream(Stream responseStream)
                            )
                         {
                             // This one will do reader.Read() internally
-                            XmlNode result = workingDocument.ReadNode(reader);
+                            XmlNode? result = workingDocument.ReadNode(reader);
                             WriteObject(result);
                         }
                         else
@@ -262,7 +265,7 @@ private static XmlReaderSettings GetSecureXmlReaderSettings()
             return xrs;
         }
 
-        private static bool TryConvertToXml(string xml, out object doc, ref Exception exRef)
+        private static bool TryConvertToXml(string xml, [NotNullWhen(true)] out object? doc, ref Exception? exRef)
         {
             try
             {
@@ -284,13 +287,12 @@ private static bool TryConvertToXml(string xml, out object doc, ref Exception ex
             return doc != null;
         }
 
-        private static bool TryConvertToJson(string json, out object obj, ref Exception exRef)
+        private static bool TryConvertToJson(string json, [NotNullWhen(true)] out object? obj, ref Exception? exRef)
         {
             bool converted = false;
             try
             {
-                ErrorRecord error;
-                obj = JsonObject.ConvertFromJson(json, out error);
+                obj = JsonObject.ConvertFromJson(json, out ErrorRecord error);
 
                 if (obj == null)
                 {
@@ -340,7 +342,7 @@ public enum RestReturnType
             /// <summary>
             /// Json return type.
             /// </summary>
-            [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")]
+            [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")]
             Json,
 
             /// <summary>
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/WebResponseObject.Common.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/WebResponseObject.Common.cs
index 8bfdeed2da4..5b89a2352fe 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/WebResponseObject.Common.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/WebResponseObject.Common.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
@@ -26,14 +28,14 @@ public class WebResponseObject
         /// <summary>
         /// Gets or protected sets the response body content.
         /// </summary>
-        public byte[] Content { get; protected set; }
+        public byte[]? Content { get; protected set; }
 
         /// <summary>
         /// Gets the Headers property.
         /// </summary>
         public Dictionary<string, IEnumerable<string>> Headers => _headers ??= WebResponseHelper.GetHeadersDictionary(BaseResponse);
 
-        private Dictionary<string, IEnumerable<string>> _headers = null;
+        private Dictionary<string, IEnumerable<string>>? _headers;
 
         /// <summary>
         /// Gets or protected sets the full response content.
@@ -41,7 +43,7 @@ public class WebResponseObject
         /// <value>
         /// Full response content, including the HTTP status line, headers, and body.
         /// </value>
-        public string RawContent { get; protected set; }
+        public string? RawContent { get; protected set; }
 
         /// <summary>
         /// Gets the length (in bytes) of <see cref="RawContentStream"/>.
@@ -56,7 +58,7 @@ public class WebResponseObject
         /// <summary>
         /// Gets the RelationLink property.
         /// </summary>
-        public Dictionary<string, string> RelationLink { get; internal set; }
+        public Dictionary<string, string>? RelationLink { get; internal set; }
 
         /// <summary>
         /// Gets the response status code.
@@ -77,8 +79,7 @@ public class WebResponseObject
         /// </summary>
         /// <param name="response">The Http response.</param>
         /// <param name="cancellationToken">The cancellation token.</param>
-        public WebResponseObject(HttpResponseMessage response, CancellationToken cancellationToken) : this(response, null, cancellationToken)
-        { }
+        public WebResponseObject(HttpResponseMessage response, CancellationToken cancellationToken) : this(response, null, cancellationToken) { }
 
         /// <summary>
         /// Initializes a new instance of the <see cref="WebResponseObject"/> class
@@ -87,7 +88,7 @@ public WebResponseObject(HttpResponseMessage response, CancellationToken cancell
         /// <param name="response">Http response.</param>
         /// <param name="contentStream">The http content stream.</param>
         /// <param name="cancellationToken">The cancellation token.</param>
-        public WebResponseObject(HttpResponseMessage response, Stream contentStream, CancellationToken cancellationToken)
+        public WebResponseObject(HttpResponseMessage response, Stream? contentStream, CancellationToken cancellationToken)
         {
             SetResponse(response, contentStream, cancellationToken);
             InitializeContent();
@@ -111,9 +112,9 @@ private void InitializeRawContent(HttpResponseMessage baseResponse)
             StringBuilder raw = ContentHelper.GetRawContentHeader(baseResponse);
 
             // Use ASCII encoding for the RawContent visual view of the content.
-            if (Content.Length > 0)
+            if (Content?.Length > 0)
             {
-                raw.Append(this.ToString());
+                raw.Append(ToString());
             }
 
             RawContent = raw.ToString();
@@ -125,26 +126,23 @@ private static bool IsPrintable(char c) => char.IsLetterOrDigit(c)
                                                 || char.IsSymbol(c)
                                                 || char.IsWhiteSpace(c);
 
-        private void SetResponse(HttpResponseMessage response, Stream contentStream, CancellationToken cancellationToken)
+        [MemberNotNull(nameof(RawContentStream))]
+        [MemberNotNull(nameof(BaseResponse))]
+        private void SetResponse(HttpResponseMessage response, Stream? contentStream, CancellationToken cancellationToken)
         {
             ArgumentNullException.ThrowIfNull(response);
 
             BaseResponse = response;
 
-            MemoryStream ms = contentStream as MemoryStream;
-            if (ms is not null)
+            if (contentStream is MemoryStream ms)
             {
                 RawContentStream = ms;
             }
             else
             {
-                Stream st = contentStream;
-                if (contentStream is null)
-                {
-                    st = StreamHelper.GetResponseStream(response, cancellationToken);
-                }
+                Stream st = contentStream ?? StreamHelper.GetResponseStream(response, cancellationToken);
 
-                long contentLength = response.Content.Headers.ContentLength.Value;
+                long contentLength = response.Content.Headers.ContentLength.GetValueOrDefault();
                 if (contentLength <= 0)
                 {
                     contentLength = StreamHelper.DefaultReadBuffer;
@@ -164,7 +162,12 @@ private void SetResponse(HttpResponseMessage response, Stream contentStream, Can
         /// <returns>The string representation of this web response.</returns>
         public sealed override string ToString()
         {
-            char[] stringContent = System.Text.Encoding.ASCII.GetChars(Content);
+            if (Content is null)
+            {
+                return string.Empty;
+            }
+
+            char[] stringContent = Encoding.ASCII.GetChars(Content);
             for (int counter = 0; counter < stringContent.Length; counter++)
             {
                 if (!IsPrintable(stringContent[counter]))
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/HttpKnownHeaderNames.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/HttpKnownHeaderNames.cs
index e0a9b3760ef..6571696e5bf 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/HttpKnownHeaderNames.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/HttpKnownHeaderNames.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
 using System.Collections.Generic;
 
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/InvokeWebRequestCommand.CoreClr.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/InvokeWebRequestCommand.CoreClr.cs
index 19ebc294c10..1e66157ef0c 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/InvokeWebRequestCommand.CoreClr.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/InvokeWebRequestCommand.CoreClr.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
 using System.IO;
 using System.Management.Automation;
@@ -37,7 +39,7 @@ internal override void ProcessResponse(HttpResponseMessage response)
             Stream responseStream = StreamHelper.GetResponseStream(response, _cancelToken.Token);
             if (ShouldWriteToPipeline)
             {
-                // creating a MemoryStream wrapper to response stream here to support IsStopping.
+                // Creating a MemoryStream wrapper to response stream here to support IsStopping.
                 responseStream = new WebResponseContentMemoryStream(
                     responseStream,
                     StreamHelper.ChunkSize,
@@ -48,7 +50,7 @@ internal override void ProcessResponse(HttpResponseMessage response)
                 ro.RelationLink = _relationLink;
                 WriteObject(ro);
 
-                // use the rawcontent stream from WebResponseObject for further
+                // Use the rawcontent stream from WebResponseObject for further
                 // processing of the stream. This is need because WebResponse's
                 // stream can be used only once.
                 responseStream = ro.RawContentStream;
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/WebProxy.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/WebProxy.cs
index 6890599b51b..6e9f6bdf98e 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/WebProxy.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/WebProxy.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
 using System.Net;
 
@@ -8,7 +10,7 @@ namespace Microsoft.PowerShell.Commands
 {
     internal class WebProxy : IWebProxy, IEquatable<WebProxy>
     {
-        private ICredentials _credentials;
+        private ICredentials? _credentials;
         private readonly Uri _proxyAddress;
 
         internal WebProxy(Uri address)
@@ -18,11 +20,11 @@ internal WebProxy(Uri address)
             _proxyAddress = address;
         }
 
-        public override bool Equals(object obj) => Equals(obj as WebProxy);
+        public override bool Equals(object? obj) => Equals(obj as WebProxy);
 
         public override int GetHashCode() => HashCode.Combine(_proxyAddress, _credentials, BypassProxyOnLocal);
 
-        public bool Equals(WebProxy other)
+        public bool Equals(WebProxy? other)
         {
             if (other is null)
             {
@@ -35,7 +37,7 @@ public bool Equals(WebProxy other)
                 && BypassProxyOnLocal == other.BypassProxyOnLocal;
         }
 
-        public ICredentials Credentials
+        public ICredentials? Credentials
         {
             get => _credentials;
 
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/WebResponseHelper.CoreClr.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/WebResponseHelper.CoreClr.cs
index eff0d658c81..6e24629548b 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/WebResponseHelper.CoreClr.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/CoreCLR/WebResponseHelper.CoreClr.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
 using System.Collections.Generic;
 using System.Globalization;
@@ -11,7 +13,7 @@ namespace Microsoft.PowerShell.Commands
 {
     internal static class WebResponseHelper
     {
-        internal static string GetCharacterSet(HttpResponseMessage response) => response.Content.Headers.ContentType?.CharSet;
+        internal static string? GetCharacterSet(HttpResponseMessage response) => response.Content.Headers.ContentType?.CharSet;
 
         internal static Dictionary<string, IEnumerable<string>> GetHeadersDictionary(HttpResponseMessage response)
         {
@@ -38,7 +40,7 @@ internal static Dictionary<string, IEnumerable<string>> GetHeadersDictionary(Htt
         internal static string GetOutFilePath(HttpResponseMessage response, string _qualifiedOutFile)
         {
             // Get file name from last segment of Uri
-            string lastUriSegment = System.Net.WebUtility.UrlDecode(response.RequestMessage.RequestUri.Segments[^1]);
+            string? lastUriSegment = System.Net.WebUtility.UrlDecode(response.RequestMessage?.RequestUri?.Segments[^1]);
 
             return Directory.Exists(_qualifiedOutFile) ? Path.Join(_qualifiedOutFile, lastUriSegment) : _qualifiedOutFile;
         }
@@ -52,7 +54,7 @@ internal static string GetOutFilePath(HttpResponseMessage response, string _qual
         internal static bool IsText(HttpResponseMessage response)
         {
             // ContentType may not exist in response header.
-            string contentType = ContentHelper.GetContentType(response);
+            string? contentType = ContentHelper.GetContentType(response);
             return ContentHelper.IsText(contentType);
         }
     }
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/FormObject.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/FormObject.cs
index b496a120329..5ac4adfbb64 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/FormObject.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/FormObject.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System.Collections.Generic;
 
 namespace Microsoft.PowerShell.Commands
@@ -46,7 +48,7 @@ public FormObject(string id, string method, string action)
 
         internal void AddField(string key, string value)
         {
-            if (key is not null && !Fields.TryGetValue(key, out string test))
+            if (key is not null && !Fields.TryGetValue(key, out string? _))
             {
                 Fields[key] = value;
             }
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/FormObjectCollection.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/FormObjectCollection.cs
index f435b92e484..5f923558185 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/FormObjectCollection.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/FormObjectCollection.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
 using System.Collections.ObjectModel;
 
@@ -16,11 +18,11 @@ public class FormObjectCollection : Collection<FormObject>
         /// </summary>
         /// <param name="key"></param>
         /// <returns></returns>
-        public FormObject this[string key]
+        public FormObject? this[string key]
         {
             get
             {
-                FormObject form = null;
+                FormObject? form = null;
                 foreach (FormObject f in this)
                 {
                     if (string.Equals(key, f.Id, StringComparison.OrdinalIgnoreCase))
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/PSUserAgent.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/PSUserAgent.cs
index e4312e74975..1a19d6b0457 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/PSUserAgent.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/PSUserAgent.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
 using System.Globalization;
 using System.Management.Automation;
@@ -14,7 +16,7 @@ namespace Microsoft.PowerShell.Commands
     /// </summary>
     public static class PSUserAgent
     {
-        private static string s_windowsUserAgent;
+        private static string? s_windowsUserAgent;
 
         // Format the user-agent string from the various component parts
         internal static string UserAgent => string.Create(CultureInfo.InvariantCulture, $"{Compatibility} ({PlatformName}; {OS}; {Culture}) {App}");
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/StreamHelper.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/StreamHelper.cs
index bec01ee8a1d..6d217cdc909 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/StreamHelper.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/StreamHelper.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System;
 using System.IO;
 using System.Management.Automation;
@@ -25,7 +27,7 @@ internal class WebResponseContentMemoryStream : MemoryStream
 
         private readonly long? _contentLength;
         private readonly Stream _originalStreamToProxy;
-        private readonly Cmdlet _ownerCmdlet;
+        private readonly Cmdlet? _ownerCmdlet;
         private readonly CancellationToken _cancellationToken;
         private bool _isInitialized = false;
 
@@ -40,7 +42,7 @@ internal class WebResponseContentMemoryStream : MemoryStream
         /// <param name="cmdlet">Owner cmdlet if any.</param>
         /// <param name="contentLength">Expected download size in Bytes.</param>
         /// <param name="cancellationToken">Cancellation token.</param>
-        internal WebResponseContentMemoryStream(Stream stream, int initialCapacity, Cmdlet cmdlet, long? contentLength, CancellationToken cancellationToken) : base(initialCapacity)
+        internal WebResponseContentMemoryStream(Stream stream, int initialCapacity, Cmdlet? cmdlet, long? contentLength, CancellationToken cancellationToken) : base(initialCapacity)
         {
             this._contentLength = contentLength;
             _originalStreamToProxy = stream;
@@ -361,7 +363,7 @@ private static string StreamToString(Stream stream, Encoding encoding, Cancellat
                 while (!completed)
                 {
                     // If this is the last input data, flush the decoder's internal buffer and state.
-                    bool flush = bytesRead == 0;
+                    bool flush = bytesRead is 0;
                     decoder.Convert(bytes, byteIndex, bytesRead - byteIndex, chars, 0, useBufferSize, flush, out int bytesUsed, out int charsUsed, out completed);
 
                     // The conversion produced the number of characters indicated by charsUsed. Write that number
@@ -386,7 +388,7 @@ private static string StreamToString(Stream stream, Encoding encoding, Cancellat
             return result.ToString();
         }
 
-        internal static string DecodeStream(Stream stream, string characterSet, out Encoding encoding, CancellationToken cancellationToken)
+        internal static string DecodeStream(Stream stream, string? characterSet, out Encoding encoding, CancellationToken cancellationToken)
         {
             bool isDefaultEncoding = !TryGetEncoding(characterSet, out encoding);
 
@@ -422,12 +424,12 @@ internal static string DecodeStream(Stream stream, string characterSet, out Enco
             return content;
         }
 
-        internal static bool TryGetEncoding(string characterSet, out Encoding encoding)
+        internal static bool TryGetEncoding(string? characterSet, out Encoding encoding)
         {
             bool result = false;
             try
             {
-                encoding = Encoding.GetEncoding(characterSet);
+                encoding = Encoding.GetEncoding(characterSet!);
                 result = true;
             }
             catch (ArgumentException)
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/WebCmdletElementCollection.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/WebCmdletElementCollection.cs
index 8336249efb5..99326898d9f 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/WebCmdletElementCollection.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/WebCmdletElementCollection.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Management.Automation;
@@ -21,23 +23,23 @@ internal WebCmdletElementCollection(IList<PSObject> list) : base(list)
         /// </summary>
         /// <param name="nameOrId"></param>
         /// <returns>Found element as PSObject.</returns>
-        public PSObject Find(string nameOrId) => FindById(nameOrId) ?? FindByName(nameOrId);
+        public PSObject? Find(string nameOrId) => FindById(nameOrId) ?? FindByName(nameOrId);
 
         /// <summary>
         /// Finds the element by id.
         /// </summary>
         /// <param name="id"></param>
         /// <returns>Found element as PSObject.</returns>
-        public PSObject FindById(string id) => Find(id, findById: true);
+        public PSObject? FindById(string id) => Find(id, findById: true);
 
         /// <summary>
         /// Finds the element by name.
         /// </summary>
         /// <param name="name"></param>
         /// <returns>Found element as PSObject.</returns>
-        public PSObject FindByName(string name) => Find(name, findById: false);
+        public PSObject? FindByName(string name) => Find(name, findById: false);
 
-        private PSObject Find(string nameOrId, bool findById)
+        private PSObject? Find(string nameOrId, bool findById)
         {
             foreach (PSObject candidate in this)
             {
diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/WebRequestMethod.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/WebRequestMethod.cs
index aa7067f1c23..9b90115a1d5 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/WebRequestMethod.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/WebRequestMethod.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#nullable enable
+
 namespace Microsoft.PowerShell.Commands
 {
     /// <summary>