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fix: Forwarding EventSource headers to requests to reuse EventSource… #339

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fix: Forwarding EventSource headers to requests to reuse EventSource's Last-Event-ID, solving the session ID reuse problem during reconnection.

Motivation and Context

The current MCP protocol in SSE mode does not yet support reconnection with sessionId. If we forward the last-event-id created by EventSource, and the SSE server delivers the sessionId as the SSE id, the client can leverage EventSource's last-event-id mechanism during reconnection to resume a connection with the same sessionId instead of issuing a new sessionId.

How Has This Been Tested?

Breaking Changes

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Additional context

…'s Last-Event-ID, solving the session ID reuse problem during reconnection.
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