use gin.Context.FullPath method instead

README.md

@@ -61,14 +61,7 @@ func main() {
 	p := ginprometheus.NewPrometheus("gin")
 
 	p.ReqCntURLLabelMappingFn = func(c *gin.Context) string {
-		url := c.Request.URL.Path
-		for _, p := range c.Params {
-			if p.Key == "name" {
-				url = strings.Replace(url, p.Value, ":name", 1)
-				break
-			}
-		}
-		return url
+		return c.FullPath()
 	}
 
 	p.Use(r)

middleware.go

@@ -17,6 +17,7 @@ import (
 var defaultMetricPath = "/metrics"
 
 // Standard default metrics
+//
 //	counter, counter_vec, gauge, gauge_vec,
 //	histogram, histogram_vec, summary, summary_vec
 var reqCnt = &Metric{
@@ -59,16 +60,9 @@ the cardinality of the request counter's "url" label, which might be required in
 For instance, if for a "/customer/:name" route you don't want to generate a time series for every
 possible customer name, you could use this function:
 
-func(c *gin.Context) string {
-	url := c.Request.URL.Path
-	for _, p := range c.Params {
-		if p.Key == "name" {
-			url = strings.Replace(url, p.Value, ":name", 1)
-			break
-		}
+	func(c *gin.Context) string {
+		return c.FullPath()
 	}
-	return url
-}
 
 which would map "/customer/alice" and "/customer/bob" to their template "/customer/:name".
 */