Using AWS S3 Virtual Hosting on the Web

Yes, it is pos­si­ble to at­tach a Ful­ly Qual­i­fied Do­main Name (FQDN) to an AWS S3 buck­et, sim­i­lar to what you might do with Cloud­flare R2. This process is known as "vir­tu­al host­ing" for S3 buck­ets. Here's how you can set it up:

1. Cre­ate an S3 buck­et: The buck­et name must ex­act­ly match the FQDN you want to use. For ex­am­ple, if you want to use bucket.example.com, your buck­et name should be bucket.example.com.

2. Con­fig­ure the buck­et for sta­t­ic web­site host­ing: En­able sta­t­ic web­site host­ing in the buck­et's prop­er­ties and set up your in­dex and er­ror doc­u­ments.

3. Set up DNS: Cre­ate a CNAME record in your DNS set­tings that points your do­main to the S3 web­site end­point. The end­point for­mat is typ­i­cal­ly: <bucket-name>.s3-website-<region>.amazonaws.com.

   For ex­am­ple, if you're us­ing the Eu­rope (Frank­furt) re­gion (eu-central-1), your CNAME record should look like this:

   Type: CNAME
   Name/Host: bucket.example.com
   Value/Target: bucket.example.com.s3-website.eu-central-1.amazonaws.com
   TTL: 3600 (or as preferred)
   

   This will al­low you to ac­cess your con­tent via http://bucket.example.com. Note that https:// ac­cess will not be avail­able.

   A bit bet­ter ap­proach is to use di­rect­ly the Ama­zon S3 reg­u­lar end­point rel­e­vant to your re­gion. So ac­cord­ing the above ex­am­ple your CNAME record should look like this:

   Type: CNAME
   Name/Host: bucket.example.com
   Value/Target: s3.eu-central-1.amazonaws.com
   TTL: 3600 (or as preferred)
   

   This al­lows you to ac­cess your buck­et's con­tent via https://bucket.example.com in an in­se­cure way. How­ev­er, it may be suf­fi­cient for your web app to load files with­out run­ning into CORS is­sues caused by HTTPS-to-HTTP re­quests. Note that in this set­up, ac­cess­ing the root URL di­rect­ly will re­sult in an Ac­cess­De­nied er­ror - even if index.html is present. There­fore, you must spec­i­fy the full path to the file, such as https://bucket.example.com/index.html.

4. Up­date buck­et pol­i­cy: En­sure your buck­et pol­i­cy al­lows pub­lic read ac­cess to the ob­jects if you're host­ing a pub­lic web­site.

5. Up­load your con­tent: Add your files to the S3 buck­et.

Im­por­tant con­sid­er­a­tions:

• This method works well for sub­do­mains (like bucket.example.com) but for root do­mains (example.com), you'll need to use Ama­zon Route 53 as your DNS provider.

• S3 web­site end­points don't sup­port HTTPS by de­fault. If you need HTTPS, you should use Ama­zon Cloud­Front in front of your S3 buck­et. Al­ways fol­low se­cu­ri­ty best prac­tices when set­ting up buck­et poli­cies.

• If you're us­ing Cloud­flare as your DNS provider, you can en­able the Prox­ied op­tion to make HTTPS con­nec­tions avail­able.

For more in­for­ma­tion, you can re­fer to the AWS doc­u­men­ta­tion on Web­site End­points and Get­ting Start­ed with S3.