change http router to gorilla/mux

.gitignore

@@ -1,5 +1,6 @@
 mystrom-exporter
 output/*
+*_string.go
 
 # Created by https://www.toptal.com/developers/gitignore/api/osx,intellij+all,windows
 # Edit at https://www.toptal.com/developers/gitignore?templates=osx,intellij+all,windows
@@ -148,4 +149,4 @@ $RECYCLE.BIN/
 # Windows shortcuts
 *.lnk
 
-# End of https://www.toptal.com/developers/gitignore/api/osx,intellij+all,windows
+# End of https://www.toptal.com/developers/gitignore/api/osx,intellij+all,windows

go.mod

@@ -3,6 +3,7 @@ module mystrom-exporter
 go 1.15
 
 require (
+	github.com/gorilla/mux v1.7.3
 	github.com/prometheus/client_golang v1.10.0
 	github.com/prometheus/common v0.18.0
 )

go.sum

@@ -99,6 +99,7 @@ github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
 github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/websocket v0.0.0-20170926233335-4201258b820c/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=

main.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/gorilla/mux"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/common/log"
@@ -69,7 +70,7 @@ func main() {
 	// -- create a new registry for the exporter telemetry
 	telemetryRegistry := setupMetrics()
 
-	router := http.NewServeMux()
+	router := mux.NewRouter()
 	router.Handle(*metricsPath, promhttp.HandlerFor(telemetryRegistry, promhttp.HandlerOpts{}))
 	router.HandleFunc(*devicePath, scrapeHandler)
 	router.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {