Fix https://github.com/kataras/iris/issues/184

I forgot to use sort.Sort lawl

http.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"net/http/pprof"
 	"os"
+	"sort"
 	"strings"
 	"sync"
 
@@ -1217,8 +1218,9 @@ func (mux *serveMux) register(method []byte, subdomain string, path string, midd
 // build collects all routes info and adds them to the registry in order to be served from the request handler
 // this happens once when server is setting the mux's handler.
 func (mux *serveMux) build() {
-	routes := bySubdomain(mux.lookups)
-	for _, r := range routes {
+
+	sort.Sort(bySubdomain(mux.lookups))
+	for _, r := range mux.lookups {
 		// add to the registry tree
 		tree := mux.getTree(r.method, r.subdomain)
 		if tree == nil {
@@ -1260,7 +1262,6 @@ func (mux *serveMux) ServeRequest() fasthttp.RequestHandler {
 
 	// initialize the router once
 	mux.build()
-
 	// optimize this once once, we could do that: context.RequestPath(mux.escapePath), but we lose some nanoseconds on if :)
 	getRequestPath := func(reqCtx *fasthttp.RequestCtx) string {
 		return utils.BytesToString(reqCtx.Path())