Why Azure App Service doesn't serve compressed(gzip) files for Angular application?

I have deployed my Angular app on Azure Web Service(gz files included), but responses returned aren't compressed so my app load is taking too long. When I look at Network tab, I see that files which are served by server aren't compressed. Also, when I check my xxx.azurewebsites.net website here it says that compression is not enabled. Is there a way to enable compressing for Azure App Service?