Not Acceptable: Client must accept both application/json and text/event-stream

[dhtml]

This bug happened on a serverless application despite using Accept: application/json, text/event-stream

To Reproduce
package.json contains "@modelcontextprotocol/sdk": "^1.15.0",
Tracing the version through package.json before now I had 1.17.3 installed and all works fine
Now that the new release is out, new deployment installed 1.25.3 which lead to the error

I temporarily resolved the problem by updating my package.json to
"@modelcontextprotocol/sdk": "^1.17.3",

Any advice on how to resolve this?

[mozmo15]

We're using 1.25.0 and have not gotten this issue, also tried upgrading to 1.25.3 and no such problem. How are you connecting to your mcp server? More details about your setup would be helpful