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+---------------------------------+ +-------------+
| socketserver.BaseRequestHandler | | SocketIO |
+---------------------------------+ +-------------+
^ | register() |
| | unregister()|
| +-------------+
| ^ ^
| | |
| + -------------------+ |
| | |
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| RPCHandler | | RPCClient |
| [attribute of RPCServer]| | |
+-------------------------+ +-----------------+
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