Fix non utf-8 sse pending (#45)

Author: leehack

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.6.4
+
+- Fix issue with StreamableHTTP server not setting correct content-type for SSE
+
 ## 0.6.3
 
 - Replace print statements with lightweight logging implementation

lib/src/server/streamable_https.dart

@@ -298,7 +298,7 @@ class StreamableHTTPServerTransport implements Transport {
     eventData += "data: ${jsonEncode(message.toJson())}\n\n";
 
     try {
-      res.write(eventData);
+      res.add(utf8.encode(eventData));
       res.flush();
       return true;
     } catch (e) {

pubspec.yaml

@@ -1,6 +1,6 @@
 name: mcp_dart
 description: Dart Implementation of Model Context Protocol (MCP) SDK.
-version: 0.6.3
+version: 0.6.4
 repository: https://github.com/leehack/mcp_dart
 
 environment: