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Update PING request handler, return empty map instead of empty string #43

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Update PING request handler, return empty map instead of empty string #43

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3 changes: 2 additions & 1 deletion mcp/src/main/java/io/modelcontextprotocol/server/McpAsyncServer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@

import java.time.Duration;
import java.util.HashMap;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
Expand Down Expand Up @@ -129,7 +130,7 @@ public class McpAsyncServer {
requestHandlers.put(McpSchema.METHOD_INITIALIZE, asyncInitializeRequestHandler());

// Ping MUST respond with an empty data, but not NULL response.
requestHandlers.put(McpSchema.METHOD_PING, (params) -> Mono.just(""));
requestHandlers.put(McpSchema.METHOD_PING, (params) -> Mono.just(Collections.emptyMap()));

// Add tools API handlers if the tool capability is enabled
if (this.serverCapabilities.tools() != null) {
Expand Down