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fix: add backward compatibility for MCP servers returning older protocol versions

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- Add ProtocolVersions interface with version constants
- Change protocolVersion() to protocolVersions() returning List<String>
- Streamable HTTP clients now support both 2024-11-05 and 2025-03-26
- Fixes compatibility with MCP servers that return 2024-11-05 instead of 2025-03-26

Resolves #436
Related to #438

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>
This commit is contained in:
Christian Tzolov 2025-08-04 12:07:31 +01:00
commit 9949657ce3
2 changed files with 107 additions and 54 deletions
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6
mcp-spring/mcp-spring-webmvc/src/main/java/io/modelcontextprotocol/server/transport/WebMvcSseServerTransportProvider.java
View file

@ -6,6 +6,7 @@ package io.modelcontextprotocol.server.transport;
import java.io.IOException;
import java.time.Duration;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantLock;
@ -16,6 +17,7 @@ import io.modelcontextprotocol.spec.McpError;
import io.modelcontextprotocol.spec.McpSchema;
import io.modelcontextprotocol.spec.McpServerTransport;
import io.modelcontextprotocol.spec.McpServerTransportProvider;
import io.modelcontextprotocol.spec.ProtocolVersions;
import io.modelcontextprotocol.spec.McpServerSession;
import io.modelcontextprotocol.util.Assert;
import io.modelcontextprotocol.util.KeepAliveScheduler;
@ -210,8 +212,8 @@ public class WebMvcSseServerTransportProvider implements McpServerTransportProvi
}
@Override
public String protocolVersion() {
return "2024-11-05";
public List<String> protocolVersions() {
return List.of(ProtocolVersions.MCP_2024_11_05);
}
@Override

5
mcp-spring/mcp-spring-webmvc/src/main/java/io/modelcontextprotocol/server/transport/WebMvcStreamableServerTransportProvider.java
View file

@ -32,6 +32,7 @@ import io.modelcontextprotocol.spec.McpSchema;
import io.modelcontextprotocol.spec.McpStreamableServerSession;
import io.modelcontextprotocol.spec.McpStreamableServerTransport;
import io.modelcontextprotocol.spec.McpStreamableServerTransportProvider;
import io.modelcontextprotocol.spec.ProtocolVersions;
import io.modelcontextprotocol.util.Assert;
import io.modelcontextprotocol.util.KeepAliveScheduler;
import reactor.core.publisher.Flux;
@ -142,8 +143,8 @@ public class WebMvcStreamableServerTransportProvider implements McpStreamableSer
}
@Override
public String protocolVersion() {
return "2025-03-26";
public List<String> protocolVersions() {
return List.of(ProtocolVersions.MCP_2024_11_05, ProtocolVersions.MCP_2025_03_26);
}
@Override