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Fix "Missing session ID" by making the MCP transport stateless #161

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brianglass merged 1 commit into from
Aug 4, 2026
+11 −0
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Fix "Missing session ID" by making the MCP transport stateless #161

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11 changes: 11 additions & 0 deletions orthocal/asgi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,8 +35,19 @@
# against a malicious webpage's JS reaching it through the browser; it
# doesn't apply to a public HTTPS API with no localhost-only trust boundary,
# so disabling it here is the correct fix, not a workaround.
#
# stateless_http must also be set: the default session manager tracks each
# session's transport in that process's own memory, but Cloud Run scales
# this service to multiple instances (maxScale=15, no session affinity
# configured) with no guarantee a session's follow-up request lands back on
# the instance that created it -- confirmed via production logs showing
# several instances each starting their own independent session manager.
# Both tools are stateless reads, so there's no reason to need session
# affinity in the first place; stateless_http=True makes every request
# self-contained instead.
mcp_application = mcp.streamable_http_app(
transport_security=TransportSecuritySettings(enable_dns_rebinding_protection=False),
stateless_http=True,
)


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