Can the sdk support transmission without SSE?

[shootercheng]

Expected Behavior

View my example project. I have covered the McpSeverSession in the sdk, making it unnecessary to maintain the state and to maintain the SSE connection

https://github.com/shootercheng/streamable-mcp/blob/dev/src/main/java/io/modelcontextprotocol/spec/McpServerSession.java

https://github.com/shootercheng/streamable-mcp/blob/dev/README.md

Current Behavior

I want to customize the McpServerSession class so that it does not need to maintain state, but I found that too much needs to be changed by reading the source code

1. McpServerSession
2. McpAsyncServer
   
3. Add a transport layer that removes SSE connections

Context

Each SSE connection maintains an open HTTP thread (in JavaWeb), potentially straining server resources under high load.

I have tried to remove SSE, but I found that just adding a WebMvcNoSseServerTransportProvider class is not enough. I also need to change the McpServerSession to remove state maintenance. I also tried to add a subclass similar to McpServerSession, and found that it does not support extension, so I need to change McpAsyncServer. If I don't change the McpAsyncServer and add a new one similar to the McpAsyncServer, the automatic loading of SpringBoot is implemented through the McpAsyncServer, so I will change more class contents

[gemo12123]

You seem to be talking about streamable. As far as I know, it has been merged but has not been officially released yet.

[shootercheng]

You seem to be talking about streamable. As far as I know, it has been merged but has not been officially released yet.

Where does the code branch? I want to see the code.

[gemo12123]

You seem to be talking about streamable. As far as I know, it has been merged but has not been officially released yet.

Where does the code branch? I want to see the code.

main

[rlacksgus97]

You can check this commit 2f94434

[shootercheng]

My issue is how to remove SSE.Additionally, the current main branch only supports WebFlux, and I forgot to mention that my project is based on WebMVC

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---Original--- From: ***@***.***> Date: Tue, Jun 24, 2025 11:27 AM To: ***@***.***>; Cc: "James ***@***.******@***.***>; Subject: Re: [modelcontextprotocol/java-sdk] Can the sdk support transmissionwithout SSE? (Issue #335) gemo12123 left a comment (modelcontextprotocol/java-sdk#335) You seem to be talking about streamable. As far as I know, it has been merged but has not been officially released yet. Where does the code branch? I want to see the code. main — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[luyiourwong]

My issue is how to remove SSE.Additionally, the current main branch only supports WebFlux, and I forgot to mention that my project is based on WebMVC
…

The snapshot includes modifications to McpSyncClientTests, so the final version will have WebMVC support.

Regarding your question about removing SSE: you can’t remove a specification if uses this protocol.
However, starting from version 2025-03-26(Snapshot), it’s possible to transmit without long-lived SSE by using streamable HTTP, which was motion earlier.

[shootercheng]

My issue is how to remove SSE.Additionally, the current main branch only supports WebFlux, and I forgot to mention that my project is based on WebMVC
…

The snapshot includes modifications to McpSyncClientTests, so the final version will have WebMVC support.

Regarding your question about removing SSE: you can’t remove a specification if uses this protocol. However, starting from version 2025-03-26(Snapshot), it’s possible to transmit without long-lived SSE by using streamable HTTP, which was motion earlier.

My sample project has removed SSE. The server does not need to maintain SSE session, and the session is also stateless.

https://github.com/shootercheng/streamable-mcp/blob/dev/README.md