add: trailing slash middleware to prevent unexpected api crash

internal/middleware/trailingslash.go

@@ -0,0 +1,23 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+)
+
+// TrailingSlashMiddleware is a middleware function that removes the trailing slash from the URL path.
+func TrailingSlashMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Check if the URL path ends with a slash and is not the root path ("/")
+		if r.URL.Path != "/" && strings.HasSuffix(r.URL.Path, "/") {
+			// Remove the trailing slash
+			r.URL.Path = strings.TrimSuffix(r.URL.Path, "/")
+			// Redirect to the new path (optional, for SEO)
+			http.Redirect(w, r, r.URL.Path, http.StatusMovedPermanently)
+			return
+		}
+
+		// Call the next handler
+		next.ServeHTTP(w, r)
+	})
+}

internal/server/httpServer.go

@@ -28,9 +28,12 @@ type HandlerMux struct {
 
 func (cim *HandlerMux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	// Convert the path to lowercase before passing to the underlying mux.
-	r.URL.Path = strings.ToLower(r.URL.Path)
-	// Apply rate limiter
-	cim.rateLimiter(w, r, cim.mux)
+	middleware.TrailingSlashMiddleware(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		r.URL.Path = strings.ToLower(r.URL.Path)
+		// Apply rate limiter
+		cim.rateLimiter(w, r, cim.mux)
+	})).ServeHTTP(w, r)
+
 }
 
 func NewHTTPServer(addr string, mux *http.ServeMux, client *db.DiceDB, limit, window int) *HTTPServer {