diff --git a/Dapplo.Jira/Entities/BaseId.cs b/Dapplo.Jira/Entities/BaseId.cs
index 3d5b14d..fe9f0cb 100644
--- a/Dapplo.Jira/Entities/BaseId.cs
+++ b/Dapplo.Jira/Entities/BaseId.cs
@@ -21,6 +21,7 @@
 
 #region using
 
+using System.ComponentModel;
 using System.Runtime.Serialization;
 
 #endregion
@@ -36,7 +37,7 @@ public class BaseId<TId>
 		/// <summary>
 		///     Id of this entity
 		/// </summary>
-		[DataMember(Name = "id", EmitDefaultValue = false)]
+		[DataMember(Name = "id", EmitDefaultValue = false), ReadOnly(true)]
 		public TId Id { get; set; }
 	}
 }
\ No newline at end of file
diff --git a/Dapplo.Jira/Entities/BaseProperties.cs b/Dapplo.Jira/Entities/BaseProperties.cs
index 1b71f15..0e3d68e 100644
--- a/Dapplo.Jira/Entities/BaseProperties.cs
+++ b/Dapplo.Jira/Entities/BaseProperties.cs
@@ -22,6 +22,7 @@
 #region using
 
 using System;
+using System.ComponentModel;
 using System.Runtime.Serialization;
 
 #endregion
@@ -37,7 +38,7 @@ public class BaseProperties<TId> : BaseId<TId>
 		/// <summary>
 		///     Link to itself
 		/// </summary>
-		[DataMember(Name = "self", EmitDefaultValue = false)]
+		[DataMember(Name = "self", EmitDefaultValue = false), ReadOnly(true)]
 		public Uri Self { get; set; }
 	}
 }
\ No newline at end of file
diff --git a/Dapplo.Jira/Entities/Comment.cs b/Dapplo.Jira/Entities/Comment.cs
index 5115416..fc4c3b5 100644
--- a/Dapplo.Jira/Entities/Comment.cs
+++ b/Dapplo.Jira/Entities/Comment.cs
@@ -22,6 +22,7 @@
 #region using
 
 using System;
+using System.ComponentModel;
 using System.Runtime.Serialization;
 
 #endregion
@@ -38,7 +39,7 @@ public class Comment : BaseProperties<long>
 		/// <summary>
 		///     Who created the comment
 		/// </summary>
-		[DataMember(Name = "author", EmitDefaultValue = false)]
+		[DataMember(Name = "author", EmitDefaultValue = false), ReadOnly(true)]
 		public User Author { get; set; }
 
 		/// <summary>
@@ -50,19 +51,19 @@ public class Comment : BaseProperties<long>
 		/// <summary>
 		///     When was the comment created
 		/// </summary>
-		[DataMember(Name = "created", EmitDefaultValue = false)]
+		[DataMember(Name = "created", EmitDefaultValue = false), ReadOnly(true)]
 		public DateTimeOffset Created { get; set; }
 
 		/// <summary>
 		///     Who updated the comment
 		/// </summary>
-		[DataMember(Name = "updateAuthor", EmitDefaultValue = false)]
+		[DataMember(Name = "updateAuthor", EmitDefaultValue = false), ReadOnly(true)]
 		public User UpdateAuthor { get; set; }
 
 		/// <summary>
 		///     When was the comment updated
 		/// </summary>
-		[DataMember(Name = "updated", EmitDefaultValue = false)]
+		[DataMember(Name = "updated", EmitDefaultValue = false), ReadOnly(true)]
 		public DateTimeOffset Updated { get; set; }
 
 		/// <summary>
diff --git a/Dapplo.Jira/IssueExtensions.cs b/Dapplo.Jira/IssueExtensions.cs
index 9274248..761e952 100644
--- a/Dapplo.Jira/IssueExtensions.cs
+++ b/Dapplo.Jira/IssueExtensions.cs
@@ -58,7 +58,8 @@ public static class IssueExtensions
 		/// <param name="body">the body of the comment</param>
 		/// <param name="visibility">optional visibility role</param>
 		/// <param name="cancellationToken">CancellationToken</param>
-		public static async Task AddCommentAsync(this IIssueDomain jiraClient, string issueKey, string body, string visibility = null, CancellationToken cancellationToken = default(CancellationToken))
+		/// <returns>Comment</returns>
+		public static async Task<Comment> AddCommentAsync(this IIssueDomain jiraClient, string issueKey, string body, string visibility = null, CancellationToken cancellationToken = default(CancellationToken))
 		{
 			if (issueKey == null)
 			{
@@ -76,7 +77,8 @@ public static async Task AddCommentAsync(this IIssueDomain jiraClient, string is
 			};
 			jiraClient.Behaviour.MakeCurrent();
 			var attachUri = jiraClient.JiraRestUri.AppendSegments("issue", issueKey, "comment");
-			await attachUri.PostAsync(comment, cancellationToken).ConfigureAwait(false);
+			var response = await attachUri.PostAsync<HttpResponse<Comment, Error>>(comment, cancellationToken).ConfigureAwait(false);
+			return response.HandleErrors(HttpStatusCode.Created);
 		}
 
 		/// <summary>
@@ -195,7 +197,8 @@ public static async Task<IList<Transition>> GetPossibleTransitionsAsync(this IIs
 		/// <param name="issueKey">jira key to which the comment belongs</param>
 		/// <param name="comment">Comment to update</param>
 		/// <param name="cancellationToken">CancellationToken</param>
-		public static async Task UpdateCommentAsync(this IIssueDomain jiraClient, string issueKey, Comment comment, CancellationToken cancellationToken = default(CancellationToken))
+		/// <returns>Comment</returns>
+		public static async Task<Comment> UpdateCommentAsync(this IIssueDomain jiraClient, string issueKey, Comment comment, CancellationToken cancellationToken = default(CancellationToken))
 		{
 			if (issueKey == null)
 			{
@@ -207,7 +210,8 @@ public static async Task UpdateCommentAsync(this IIssueDomain jiraClient, string
 			jiraClient.Behaviour.MakeCurrent();
 
 			var attachUri = jiraClient.JiraRestUri.AppendSegments("issue", issueKey, "comment", comment.Id);
-			await attachUri.PutAsync(comment, cancellationToken).ConfigureAwait(false);
+			var response = await attachUri.PutAsync<HttpResponse<Comment, Error>>(comment, cancellationToken).ConfigureAwait(false);
+			return response.HandleErrors();
 		}
 
 		/// <summary>
@@ -241,7 +245,7 @@ public static async Task<Issue> CreateAsync(this IIssueDomain jiraClient, Issue
 			jiraClient.Behaviour.MakeCurrent();
 			var issueUri = jiraClient.JiraRestUri.AppendSegments("issue");
 			var response = await issueUri.PostAsync<HttpResponse<Issue, Error>>(issue, cancellationToken).ConfigureAwait(false);
-			return response.HandleErrors();
+			return response.HandleErrors(HttpStatusCode.Created);
 		}
 
 		/// <summary>
@@ -265,12 +269,7 @@ public static async Task DeleteAsync(this IIssueDomain jiraClient, string issueK
 				issueUri = issueUri.ExtendQuery("deleteSubtasks", true);
 			}
 			var response = await issueUri.DeleteAsync<HttpResponse>(cancellationToken).ConfigureAwait(false);
-			if (response.StatusCode != HttpStatusCode.NoContent)
-			{
-				var message = response.StatusCode.ToString();
-				Log.Warn().WriteLine("Http status code: {0}. Response from server: {1}", response.StatusCode, message);
-				throw new Exception($"Status: {response.StatusCode} Message: {message}");
-			}
+			response.HandleStatusCode(HttpStatusCode.NoContent);
 		}
 
 		/// <summary>