fix: SSEClientTransport drops path prefix when endpoint URL is not on the HTTP root #741
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When connecting to an SSE server behind a reverse proxy with path-based routing, the client was incorrectly dropping the path prefix when resolving the message endpoint. This happened because URL resolution of an absolute path (starting with "/") replaces the entire existing path. The fix converts absolute paths to relative paths by stripping the leading "/" before resolution. This ensures the base URL's path prefix is preserved during relative URL resolution. Fixes modelcontextprotocol#687 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> Signed-off-by: majiayu000 <1835304752@qq.com>
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Fixes #687
Changes
/from endpoint path before URL resolution to preserve base URL's path prefix