support sse though get

src/examples/client/simpleStreamableHttp.ts

@@ -11,7 +11,8 @@ import {
   GetPromptResultSchema,
   ListResourcesRequest,
   ListResourcesResultSchema,
-  LoggingMessageNotificationSchema
+  LoggingMessageNotificationSchema,
+  ResourceListChangedNotificationSchema
 } from '../../types.js';
 
 async function main(): Promise<void> {
@@ -24,51 +25,80 @@ async function main(): Promise<void> {
   const transport = new StreamableHTTPClientTransport(
     new URL('http://localhost:3000/mcp')
   );
+  const supportsStandaloneSse = false;
 
   // Connect the client using the transport and initialize the server
   await client.connect(transport);
+  console.log('Connected to MCP server');
+  // Open a standalone SSE stream to receive server-initiated messages
+  console.log('Opening SSE stream to receive server notifications...');
+  try {
+    await transport.openSseStream();
+    const supportsStandaloneSse = false;
+    console.log('SSE stream established successfully. Waiting for notifications...');
+  }
+  catch (error) {
+    console.error('Failed to open SSE stream:', error);
+  }
+
+  // Set up notification handlers for server-initiated messages
   client.setNotificationHandler(LoggingMessageNotificationSchema, (notification) => {
     console.log(`Notification received: ${notification.params.level} - ${notification.params.data}`);
   });
-
-
-  console.log('Connected to MCP server');
-  // List available tools
-  const toolsRequest: ListToolsRequest = {
-    method: 'tools/list',
-    params: {}
-  };
-  const toolsResult = await client.request(toolsRequest, ListToolsResultSchema);
-  console.log('Available tools:', toolsResult.tools);
-
-  // Call the 'greet' tool
-  const greetRequest: CallToolRequest = {
-    method: 'tools/call',
-    params: {
-      name: 'greet',
-      arguments: { name: 'MCP User' }
-    }
-  };
-  const greetResult = await client.request(greetRequest, CallToolResultSchema);
-  console.log('Greeting result:', greetResult.content[0].text);
-
-  // Call the new 'multi-greet' tool
-  console.log('\nCalling multi-greet tool (with notifications)...');
-  const multiGreetRequest: CallToolRequest = {
-    method: 'tools/call',
-    params: {
-      name: 'multi-greet',
-      arguments: { name: 'MCP User' }
-    }
-  };
-  const multiGreetResult = await client.request(multiGreetRequest, CallToolResultSchema);
-  console.log('Multi-greet results:');
-  multiGreetResult.content.forEach(item => {
-    if (item.type === 'text') {
-      console.log(`- ${item.text}`);
-    }
+  client.setNotificationHandler(ResourceListChangedNotificationSchema, async (_) => {
+    console.log(`Resource list changed notification received!`);
+    const resourcesRequest: ListResourcesRequest = {
+      method: 'resources/list',
+      params: {}
+    };
+    const resourcesResult = await client.request(resourcesRequest, ListResourcesResultSchema);
+    console.log('Available resources count:', resourcesResult.resources.length);
   });
 
+  // List available tools
+  try {
+    const toolsRequest: ListToolsRequest = {
+      method: 'tools/list',
+      params: {}
+    };
+    const toolsResult = await client.request(toolsRequest, ListToolsResultSchema);
+    console.log('Available tools:', toolsResult.tools);
+
+    if (toolsResult.tools.length === 0) {
+      console.log('No tools available from the server');
+    } else {
+      // Call the 'greet' tool
+      const greetRequest: CallToolRequest = {
+        method: 'tools/call',
+        params: {
+          name: 'greet',
+          arguments: { name: 'MCP User' }
+        }
+      };
+      const greetResult = await client.request(greetRequest, CallToolResultSchema);
+      console.log('Greeting result:', greetResult.content[0].text);
+
+      // Call the new 'multi-greet' tool
+      console.log('\nCalling multi-greet tool (with notifications)...');
+      const multiGreetRequest: CallToolRequest = {
+        method: 'tools/call',
+        params: {
+          name: 'multi-greet',
+          arguments: { name: 'MCP User' }
+        }
+      };
+      const multiGreetResult = await client.request(multiGreetRequest, CallToolResultSchema);
+      console.log('Multi-greet results:');
+      multiGreetResult.content.forEach(item => {
+        if (item.type === 'text') {
+          console.log(`- ${item.text}`);
+        }
+      });
+    }
+  } catch (error) {
+    console.log(`Tools not supported by this server (${error})`);
+  }
+
   // List available prompts
   try {
     const promptsRequest: ListPromptsRequest = {
@@ -107,9 +137,11 @@ async function main(): Promise<void> {
   } catch (error) {
     console.log(`Resources not supported by this server (${error})`);
   }
+  if (supportsStandaloneSse) {
+    // Instead of closing immediately, keep the connection open to receive notifications
+    console.log('\nKeeping connection open to receive notifications. Press Ctrl+C to exit.');
+  }
 
-  // Close the connection
-  await client.close();
 }
 
 main().catch((error: unknown) => {