diff --git a/Pilz.Net/Api/ApiClient.cs b/Pilz.Net/Api/ApiClient.cs
index 2844e45..eea248b 100644
--- a/Pilz.Net/Api/ApiClient.cs
+++ b/Pilz.Net/Api/ApiClient.cs
@@ -100,7 +100,17 @@ public class ApiClient(string apiUrl) : IApiClient
 
         Log.Debug("Create content");
 
-        if (context.Message is not null)
+        if (context.Message is ApiRawByteMessage messageRawBytes)
+        {
+            content = new ByteArrayContent(messageRawBytes.Data);
+            content.Headers.ContentType = new("application/octet-stream");
+        }
+        else if (context.Message is ApiRawStreamMessage messageRawStream)
+        {
+            content = new StreamContent(messageRawStream.Data);
+            content.Headers.ContentType = new("application/octet-stream");
+        }
+        else if (context.Message is not null)
             content = new StringContent(context.Serializer.Serialize(context.Message)!, null, "application/json");
         else
             content = new StringContent(string.Empty, null, "application/json");
diff --git a/Pilz.Net/Api/ApiRawStreamMessage.cs b/Pilz.Net/Api/ApiRawStreamMessage.cs
index a28acb0..b232f2c 100644
--- a/Pilz.Net/Api/ApiRawStreamMessage.cs
+++ b/Pilz.Net/Api/ApiRawStreamMessage.cs
@@ -3,4 +3,10 @@
 public class ApiRawStreamMessage(Stream data) : ApiRawMessage
 {
     public Stream Data { get; } = data;
+    public virtual long Length => Data.Length;
+}
+
+public class ApiRawInputStreamMessage(Stream data, long length) : ApiRawStreamMessage(data)
+{
+    public override long Length => length;
 }
diff --git a/Pilz.Net/Api/ApiServer.cs b/Pilz.Net/Api/ApiServer.cs
index 8c2aed9..ef3332e 100644
--- a/Pilz.Net/Api/ApiServer.cs
+++ b/Pilz.Net/Api/ApiServer.cs
@@ -436,37 +436,9 @@ public class ApiServer : IApiServer
         if (context.Request.Headers.Get("API-AUTH-KEY") is not string authKey)
             authKey = null!;
 
-        // Read input content
-        Log.Debug("Read input content");
-        string? contentJson;
-        if (context.Request.ContentType is string contentType
-            && contentType.Contains("application/json")
-            && context.Request.ContentLength64 > 0)
-        {
-            try
-            {
-                using StreamReader input = new(context.Request.InputStream);
-                contentJson = input.ReadToEnd();
-            }
-            catch (OutOfMemoryException)
-            {
-                Log.Error("Error reading remote data due to missing memory");
-                close(true);
-                return;
-            }
-            catch (Exception ex)
-            {
-                Log.Error("Error reading remote data", ex);
-                close(true);
-                return;
-            }
-        }
-        else
-            contentJson = null;
-
         // Handle message
         Log.Debug("Handle mssage");
-        if (HandleMessage(context, path, query, handler, contentJson, authKey) is not PrivateApiResult result)
+        if (HandleMessage(context, path, query, handler, authKey) is not PrivateApiResult result)
         {
             Log.Warn("Request couldn't be handled");
             close(true);
@@ -514,7 +486,7 @@ public class ApiServer : IApiServer
         return;
     }
 
-    protected virtual PrivateApiResult? HandleMessage(HttpListenerContext context, string url, string? query, PrivateMessageHandler handler, string? json, string? authKey)
+    protected virtual PrivateApiResult? HandleMessage(HttpListenerContext context, string url, string? query, PrivateMessageHandler handler, string? authKey)
     {
         // Check authentication
         Log.Debug("Check authentication");
@@ -530,13 +502,46 @@ public class ApiServer : IApiServer
         var targetType = handler.Handler.Method.GetParameters().FirstOrDefault(p => p.ParameterType.IsAssignableTo(typeof(ApiMessage)))?.ParameterType;
         var serializer = GetSerializer(handler.Attribute.Serializer);
 
-        // Deserialize
-        Log.Debug("Deserialize message");
-        ApiMessage? message;
-        if (json != null && targetType != null)
-            message = serializer.Deserialize(json, targetType);
-        else
-            message = null;
+        // Read input content
+        Log.Debug("Read input content");
+        ApiMessage? message = null;
+        switch (context.Request.ContentType)
+        {
+            case "application/json":
+                try
+                {
+                    Log.Debug("Deserialize message");
+                    using StreamReader input = new(context.Request.InputStream);
+                    var contentJson = input.ReadToEnd();
+                    if (targetType == null)
+                        return null;
+                    message = serializer.Deserialize(contentJson, targetType);
+                }
+                catch (OutOfMemoryException)
+                {
+                    Log.Error("Error reading remote data due to missing memory");
+                    return null;
+                }
+                catch (Exception ex)
+                {
+                    Log.Error("Error reading remote data", ex);
+                    return null;
+                }
+                break;
+            case "application/octet-stream":
+                Log.Debug("Process raw message");
+                if (targetType == null)
+                    return null;
+                else if (targetType.IsAssignableTo(typeof(ApiRawByteMessage)))
+                {
+                    var bytes = new byte[context.Request.ContentLength64];
+                    context.Request.InputStream.Read(bytes, 0, bytes.Length);
+                    message = new ApiRawByteMessage(bytes);
+                }
+                else if (targetType.IsAssignableTo(typeof(ApiRawStreamMessage)))
+                    message = new ApiRawInputStreamMessage(context.Request.InputStream, context.Request.ContentLength64);
+                break;
+        }
 
         // Invoke handler
         Log.Debug("Invoke handler");
diff --git a/Pilz.Net/Pilz.Net.csproj b/Pilz.Net/Pilz.Net.csproj
index b4e3f77..277e119 100644
--- a/Pilz.Net/Pilz.Net.csproj
+++ b/Pilz.Net/Pilz.Net.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <Version>2.10.4</Version>
+    <Version>2.11.0</Version>
   </PropertyGroup>
   
   <ItemGroup>