<p>The current behaviour appears to be deliberate (<a href="https://github.com/openstreetmap/chef/blob/master/cookbooks/web/templates/default/apache.frontend.erb#L97">https://github.com/openstreetmap/chef/blob/master/cookbooks/web/templates/default/apache.frontend.erb#L97</a>) and I suspect reflects what rails was recommending when the asset pipeline was introduced.</p>
<p>The current recommendation (<a href="https://guides.rubyonrails.org/asset_pipeline.html#far-future-expires-header" rel="nofollow">https://guides.rubyonrails.org/asset_pipeline.html#far-future-expires-header</a>) seems to have dropped that though and just drops ETag and sets the expiry.</p>
<p>So we could change it but I don't see any likely gain especially as the actual times aren't very meaningful.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/openstreetmap/openstreetmap-website/issues/2260?email_source=notifications&email_token=AAK2OLKSAMS2EZ47QQQY46LP2Z3ODA5CNFSM4HYRTLRKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODXZRXEQ#issuecomment-502471570">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/AAK2OLM2A7XWXTGFTVODS6TP2Z3ODANCNFSM4HYRTLRA">mute the thread</a>.<img src="https://github.com/notifications/beacon/AAK2OLLOGEU2Y6HXAYNZ26DP2Z3ODA5CNFSM4HYRTLRKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODXZRXEQ.gif" height="1" width="1" alt="" /></p>
<script type="application/ld+json">[
{
"@context": "http://schema.org",
"@type": "EmailMessage",
"potentialAction": {
"@type": "ViewAction",
"target": "https://github.com/openstreetmap/openstreetmap-website/issues/2260?email_source=notifications\u0026email_token=AAK2OLKSAMS2EZ47QQQY46LP2Z3ODA5CNFSM4HYRTLRKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODXZRXEQ#issuecomment-502471570",
"url": "https://github.com/openstreetmap/openstreetmap-website/issues/2260?email_source=notifications\u0026email_token=AAK2OLKSAMS2EZ47QQQY46LP2Z3ODA5CNFSM4HYRTLRKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODXZRXEQ#issuecomment-502471570",
"name": "View Issue"
},
"description": "View this Issue on GitHub",
"publisher": {
"@type": "Organization",
"name": "GitHub",
"url": "https://github.com"
}
}
]</script>