Update Cache-Control strategy

Author: ije

server/server.ts

@@ -127,6 +127,8 @@ export class Server {
 
       // set server header
       resp.setHeader('Server', 'Aleph.js')
+      // by default, we use `Last-Modified` and `ETag` header to control cache
+      resp.setHeader('Cache-Control', 'public, max-age=0, must-revalidate')
 
       // set custom headers
       if (headers) {
@@ -135,9 +137,6 @@ export class Server {
         }
       }
 
-      // we use `Last-Modified` and `ETag` header to control cache
-      resp.setHeader('Cache-Control', 'max-age=0')
-
       // serve dist files
       if (pathname.startsWith('/_aleph/')) {
         if (pathname.startsWith('/_aleph/data/') && pathname.endsWith('.json')) {