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chromium/third_party/blink/web_tests/http/tests/loading/wbn/resources/wbn/.htaccess 

AddType application/webbundle .wbn
AddType application/webbundle .wbn-without-nosniff
<FilesMatch "\.wbn$">
  Header set X-Content-Type-Options "nosniff"
  # Allow bundles to be fetched via CORS.
  Header set Access-Control-Allow-Origin "*"
</FilesMatch>