diff --git a/pages.go b/pages.go
index 9c906b9..8ae333b 100644
--- a/pages.go
+++ b/pages.go
@@ -5,6 +5,7 @@ import (
 	"io"
 	"net/http"
 	"os"
+	"strconv"
 
 	_ "embed"
 )
@@ -27,6 +28,7 @@ func SendIndex(wr http.ResponseWriter, req *http.Request) {
 	}
 	resp.Header = http.Header{}
 	resp.Header.Add("Content-Type", "text/html")
+	resp.Header.Add("Content-Length", strconv.Itoa(len(index)))
 	resp.Header.Add("Server", "astra")
 	req.Response = &resp
 	copyHeader(wr.Header(), resp.Header)