Compress more http content-types.

Also, some minor refactoring

server/middlewares.go

@@ -61,7 +61,7 @@ func loggerInjector(next http.Handler) http.Handler {
 	})
 }
 
-func robotsTXT(fs fs.FS) func(next http.Handler) http.Handler {
+func robotsTXT(fs fs.FS) func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			if strings.HasSuffix(r.URL.Path, "/robots.txt") {
@@ -74,7 +74,7 @@ func robotsTXT(fs fs.FS) func(next http.Handler) http.Handler {
 	}
 }
 
-func corsHandler() func(h http.Handler) http.Handler {
+func corsHandler() func(http.Handler) http.Handler {
 	return cors.Handler(cors.Options{
 		AllowedOrigins: []string{"*"},
 		AllowedMethods: []string{
@@ -91,7 +91,7 @@ func corsHandler() func(h http.Handler) http.Handler {
 	})
 }
 
-func secureMiddleware() func(h http.Handler) http.Handler {
+func secureMiddleware() func(http.Handler) http.Handler {
 	sec := secure.New(secure.Options{
 		ContentTypeNosniff: true,
 		FrameDeny:          true,
@@ -102,6 +102,19 @@ func secureMiddleware() func(h http.Handler) http.Handler {
 	return sec.Handler
 }
 
+func compressMiddleware() func(http.Handler) http.Handler {
+	return middleware.Compress(
+		5,
+		"application/xml",
+		"application/json",
+		"application/javascript",
+		"text/html",
+		"text/plain",
+		"text/css",
+		"text/javascript",
+	)
+}
+
 func clientUniqueIdAdder(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		ctx := r.Context()