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Client requested unsupported protocol version: 2025年06月18日, so the server will suggest the 2024年11月05日 version instead #4682

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myifeng asked this question in Q&A
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Server: Spring Ai: 1.0.3
Client: mcp: 1.13.1

from mcp.client.sse import sse_client
sse_client("http://localhost:8080/sse")
2025年10月20日T20:08:05.156+08:00 WARN 1 --- [nio-8080-exec-1] i.m.server.McpAsyncServer : Client requested unsupported protocol version: 2025年06月18日, so the server will suggest the 2024年11月05日 version instead

How to supported protocol version: 2025年06月18日 ?

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Replies: 1 comment

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Do you have spring.ai.mcp.server.protocol property in your application.yml file?
I had the same error and add this:
spring.ai.mcp.server.protocol: stateless
solved it

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