Removed a bit more Obsolete things as they aren't Obsolete as such, the next major will have to be incompatible anyway

Author: alexeyzimarev

src/RestSharp/Http.cs

@@ -223,12 +223,9 @@ static void AddRange(HttpWebRequest r, string range) {
     public bool ThrowOnAnyError { get; set; }
 
     [Obsolete]
-    public static IHttp Create()
-        => new Http();
+    public static IHttp Create() => new Http();
 
-    [Obsolete("Overriding this method won't be possible in future version")]
-    protected virtual HttpWebRequest? CreateWebRequest(Uri url)
-        => null;
+    protected virtual HttpWebRequest? CreateWebRequest(Uri url) => null;
 
     static HttpWebRequest CreateRequest(Uri uri)
         => (HttpWebRequest)WebRequest.Create(uri);

src/RestSharp/HttpCookie.cs

@@ -19,7 +19,6 @@ namespace RestSharp
     /// <summary>
     /// Representation of an HTTP cookie
     /// </summary>
-    [Obsolete("The HttpCookie class will be removed in future versions")]
     public class HttpCookie
     {
         /// <summary>

src/RestSharp/HttpHeader.cs

@@ -44,7 +44,6 @@ public HttpHeader(string name, object? value) : this(name, value?.ToString()) {
         /// <summary>
         /// Creates a new instance of HttpHeader. Remember to assign properties!
         /// </summary>
-        [Obsolete("Use parameterized constructor")]
         public HttpHeader() { }
 
         /// <summary>

src/RestSharp/HttpParameter.cs

@@ -44,7 +44,6 @@ public HttpParameter(string name, string? value, string? contentType = null)
         /// <param name="contentType">Parameter content type</param>
         public HttpParameter(string name, object? value, string? contentType = null) : this(name, value?.ToString(), contentType) { }
 
-        [Obsolete("Use parameterized constructor")]
         public HttpParameter() { }
 
         /// <summary>

src/RestSharp/IRestRequest.cs

@@ -207,7 +207,6 @@ public interface IRestRequest
         /// <param name="obj">The object to serialize</param>
         /// <param name="xmlNamespace">The XML namespace to use when serializing</param>
         /// <returns>This request</returns>
-        [Obsolete("Use AddJsonBody or AddXmlBody instead")]
         IRestRequest AddBody(object obj, string xmlNamespace);
 
         /// <summary>
@@ -216,7 +215,6 @@ public interface IRestRequest
         /// </summary>
         /// <param name="obj">The object to serialize</param>
         /// <returns>This request</returns>
-        [Obsolete("Use AddJsonBody or AddXmlBody instead")]
         IRestRequest AddBody(object obj);
 
         /// <summary>

src/RestSharp/RequestBody.cs

@@ -20,7 +20,6 @@ public class RequestBody {
         public string Name { get; }
         public object Value { get; }
 
-        [Obsolete("The RestBody constructor will be internal in future versions")]
         public RequestBody(string contentType, string name, object value) {
             ContentType = contentType;
             Name        = name;

src/RestSharp/RestRequest.cs

@@ -235,7 +235,6 @@ public IRestRequest AddFileBytes(
         }
 
         /// <inheritdoc />
-        [Obsolete("Use AddXmlBody")]
         public IRestRequest AddBody(object obj, string xmlNamespace)
             => RequestFormat switch
             {
@@ -245,7 +244,6 @@ public IRestRequest AddBody(object obj, string xmlNamespace)
             };
 
         /// <inheritdoc />
-        [Obsolete("Use AddXmlBody or AddJsonBody")]
         public IRestRequest AddBody(object obj)
             => RequestFormat switch
             {
@@ -467,7 +465,6 @@ public IRestRequest AddDecompressionMethod(DecompressionMethods decompressionMet
         public DataFormat RequestFormat { get; set; }
 
         /// <inheritdoc />
-        [Obsolete("Add custom content handler instead. This property will be removed.")]
         public string RootElement { get; set; }
 
         /// <inheritdoc />
@@ -477,11 +474,9 @@ public IRestRequest AddDecompressionMethod(DecompressionMethods decompressionMet
         public Action<IHttp>? OnBeforeRequest { get; set; }
 
         /// <inheritdoc />
-        [Obsolete("Add custom content handler instead. This property will be removed.")]
         public string DateFormat { get; set; }
 
         /// <inheritdoc />
-        [Obsolete("Add custom content handler instead. This property will be removed.")]
         public string XmlNamespace { get; set; }
 
         /// <inheritdoc />

src/RestSharp/RestResponseCookie.cs

@@ -16,7 +16,6 @@
 
 namespace RestSharp
 {
-    [Obsolete("We will use HttpCookie in the response as well in the next major version")]
     public class RestResponseCookie
     {
         /// <summary>