Refactor engine server router.py
Refactor engine server router.py


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Former-commit-id: 15339efb1c34e9a82db70fdf63a5f0b6589c1895
Former-commit-id: 41681f289900a5bad40a11be179518eff9274501
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine