Can Go Handle Inplace URL Parameter Mapping?

Inplace URL Parameters in Go

Native Go lacks a fundamental mechanism for inplace URL parameter mapping. However, implementing such a feature is relatively straightforward.

Custom Solution

The following approach does not rely on external libraries:

1. Split the URL path (r.URL.Path) into components.

2. Analyze each component:

   • If the first component is a valid integer, treat it as the URL parameter.
   • Return the default parameter value (and the second component) if no parameter is found or the parameter is invalid.

Code Sample

func getCode(r *http.Request, defaultCode int) (int, string) {
    p := strings.Split(r.URL.Path, "/")

    if len(p) == 1 {
        return defaultCode, p[0]
    } else if len(p) > 1 {
        code, err := strconv.Atoi(p[0])
        if err == nil {
            return code, p[1]
        } else {
            return defaultCode, p[1]
        }
    } else {
        return defaultCode, ""
    }
}

This code can be invoked within request handlers using the getCode() function.

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