Routing with ServeMux

Output:

GET    /orders      200 "all orders"
POST   /orders      201 "order created"
GET    /orders/1001 200 "order number 1001"
DELETE /orders      405 "Method Not Allowed\n"
GET    /customers   404 "404 page not found\n"

Three registrations produced five different results, and no third-party router was involved. The method and the path are both part of each pattern, so POST /orders runs a different function than GET /orders. The handler reads the value of {id} with r.PathValue. The `DELETE

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