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Accessing Path Parameters in Go's HTTP Request Handler
When developing a REST API in Go without using web frameworks, retrieving path parameters from HTTP requests requires manual parsing. Let's delve into the implementation:
Mapping Path Variables
The first step is to map the desired path variable, in this case "id," to the corresponding handler. This is done using http.HandleFunc:
http.HandleFunc("/provisions/:id", Provisions)
The :id portion in the path indicates that it's a placeholder for a dynamic parameter.
Retrieving Path Parameters from Request
Within the Provisions handler function, we can extract the "id" parameter from the request object r:
func Provisions(w http.ResponseWriter, r *http.Request) { id := strings.TrimPrefix(r.URL.Path, "/provisions/") // Process the id parameter as needed }
The strings.TrimPrefix method removes the "/provisions/" prefix from the path, leaving only the "id" parameter value. This approach provides a simple and versatile way to handle path parameters without the overhead of web frameworks.
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