github.com/Neil-uli/go-play/pattern-routing

Pattern Routing

In Go is handled by the DefaultServeMux method which is an instance of ServeMux. When nil is passed to the handler parameter for the ListenAndServe function then the DefaultServeMux just indirectly calling http.DefaultServeMux.HandleFunc(...).

ServeMux allows variable parts in url patterns and stub out the routes we'd like the application to have.

Choosing a Muxer

Many web apps handle requests to URLs with variable parts such as /settings/godric or /notes/42. ServeMux handles HTTP requests by multiplexing over handlers registered to fixed patterns only, but remember that ServeMux is just one implementation of the Handler interface. net/http wisely defines the foundation Server and Requst, but leaves handling to anything that implements ServeHTTP(ResponseWriter, *Request).

• Patterns with parameters and easy retrieval of their values
• HTTP method matching rules
• Route reversal to build redirection URLs from a handler

Example

HTTP Verb	Path	Action	Description
GET	/notes	list	list multiple notes
POST	/notes	create	create a note
GET	/notes/{id}	read	get a note
PUT	/notes/{id}	update	update a note
DELETE	/notes/{id}	delete	delete a note

$ curl -X POST http://localhost:8080/api/v1/notes      # note create
$ curl -X PUT http://localhost:8080/api/v1/notes/3     # update note 3
$ curl -X DELETE http://localhost:8080/api/v1/notes/3  # delete note 3