How to Access Path Parameters in Go's HTTP Request Handler?

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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