Define HTTP server timeout and header size constants

internal/server/http.go

@@ -6,13 +6,20 @@ import (
 	"time"
 )
 
+// HTTP server configuration constants.
+const (
+	HTTPReadTimeout  = 30 * time.Second
+	HTTPWriteTimeout = 60 * time.Second
+	HTTPMaxHeaderKB  = 8
+)
+
 func (s *Server) serveUntilShutdown() {
 	listenAddr := fmt.Sprintf(":%d", s.config.Port)
 	s.httpServer = &http.Server{
 		Addr:           listenAddr,
-		ReadTimeout:    30 * time.Second,
-		WriteTimeout:   60 * time.Second,
-		MaxHeaderBytes: 1 << 13, // 8KB
+		ReadTimeout:    HTTPReadTimeout,
+		WriteTimeout:   HTTPWriteTimeout,
+		MaxHeaderBytes: HTTPMaxHeaderKB * 1024,
 		Handler:        s,
 	}