Setting service worker to exclude certain urls only

So, considering, you have not posted any code relevant to the service worker, you might consider adding a simple if conditional inside the code block for fetch

This code block should already be there inside your service worker.Just add the conditionals

self.addEventListener( 'fetch', function ( event ) {

    if ( event.request.url.match( '^.*(\/blog\/).*$' ) ) {
        return false;
    }
     // OR

    if ( event.request.url.indexOf( '/blog/' ) !== -1 ) {
        return false;
    }
    //    **** rest of your service worker code ****

note you can either use the regex or the prototype method indexOf. per your whim.

the above would direct your service worker, to just do nothing when the url matches /blog/

Another way to blacklist URLs, i.e., exclude them from being served from cache, when you're using Workbox can be achieved with workbox.routing.registerNavigationRoute:

workbox.routing.registerNavigationRoute("/index.html", {
  blacklist: [/^\/api/,/^\/admin/],
});

The example above demonstrates this for a SPA where all routes are cached and mapped into index.html except for any URL starting with /api or /admin.