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mcp: export session missing error (#771)

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Fix: #715

- export session missing error
- modify `errSessionMissing` to `ErrSessionMissing`
- add unit test about session missing error
This commit is contained in:
FanOne 2026-02-03 22:46:49 +08:00 • committed by GitHub
commit 7ecd8049c6
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1 changed files with 55 additions and 18 deletions
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6
mcp/streamable_client.go
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@ -161,7 +161,7 @@ The client must handle two response formats from POST requests:
- DELETE: Terminate the session
- Used by [streamableClientConn.Close]
- Skipped if session is already known to be gone ([errSessionMissing])
- Skipped if session is already known to be gone ([ErrSessionMissing])
# Error Handling
@ -173,7 +173,7 @@ Errors are categorized and handled differently:
- Triggers reconnection in [streamableClientConn.handleSSE]
2. Terminal (breaks the connection):
- 404 Not Found: Session terminated by server ([errSessionMissing])
- 404 Not Found: Session terminated by server ([ErrSessionMissing])
- Message decode errors: Protocol violation
- Context cancellation: Client closed connection
- Mismatched session IDs: Protocol error
@ -183,7 +183,7 @@ Terminal errors are stored via [streamableClientConn.fail] and returned by
subsequent [streamableClientConn.Read] calls. The [streamableClientConn.failed]
channel signals that the connection is broken.
Special case: [errSessionMissing] indicates the server has terminated the session,
Special case: [ErrSessionMissing] indicates the server has terminated the session,
so [streamableClientConn.Close] skips the DELETE request.
# Protocol Version Header