Don't warn for empty client data

src/main.ts

@@ -57,7 +57,7 @@ http
     req.on("end", () => {
       const sender = req.headers["user-agent"];
       if (!isPost) {
-        logger.warn(`${emp(sender)} sent no data.`)
+        logger.log(`${emp(sender)} sent no data.`)
 
         res.writeHead(400, contentType);
         res.write(response.error("Invalid content-type"));