web/dotnet-src/Web/Startup.cs

using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Reflection;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace Bit.Web
{
    public class Startup
    {
        private readonly List<string> _longCachedPaths = new List<string>
        {
            "/app/", "/locales/", "/fonts/", "/connectors/", "/scripts/"
        };
        private readonly List<string> _mediumCachedPaths = new List<string>
        {
            "/images/"
        };

        public Startup()
        {
            CultureInfo.DefaultThreadCurrentCulture = new CultureInfo("en-US");
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddRouting();
        }

        public void Configure(
            IApplicationBuilder app,
            IConfiguration configuration)
        {
            // TODO: This should be removed when asp.net natively support avif
            var provider = new FileExtensionContentTypeProvider { Mappings = { [".avif"] = "image/avif" } };

            var options = new DefaultFilesOptions();
            options.DefaultFileNames.Clear();
            options.DefaultFileNames.Add("index.html");
            app.UseDefaultFiles(options);
            app.UseStaticFiles(new StaticFileOptions
            {
                ContentTypeProvider = provider,
                OnPrepareResponse = ctx =>
                {
                    if (!ctx.Context.Request.Path.HasValue ||
                        ctx.Context.Response.Headers.ContainsKey("Cache-Control"))
                    {
                        return;
                    }
                    var path = ctx.Context.Request.Path.Value;
                    if (_longCachedPaths.Any(ext => path.StartsWith(ext)))
                    {
                        // 14 days
                        ctx.Context.Response.Headers.Append("Cache-Control", "max-age=1209600");
                    }
                    if (_mediumCachedPaths.Any(ext => path.StartsWith(ext)))
                    {
                        // 7 days
                        ctx.Context.Response.Headers.Append("Cache-Control", "max-age=604800");
                    }
                }
            });
            app.UseRouting();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGet("/alive",
                    async context => await context.Response.WriteAsJsonAsync(System.DateTime.UtcNow));
                endpoints.MapGet("/version",
                    async context => await context.Response.WriteAsJsonAsync(Assembly.GetEntryAssembly()
                        .GetCustomAttribute<AssemblyInformationalVersionAttribute>().InformationalVersion));
            });
        }
    }
}