I have this simple Apache vhost, it's the only one enabled:
<VirtualHost *:8000>
ServerName store.com
ServerAdmin admin@store.com
DocumentRoot /var/www/store/public
ErrorLog ${APACHE_LOG_DIR}/store-error.log
CustomLog ${APACHE_LOG_DIR}/store-access.log combined
ProxyPreserveHost On
ProxyRequests Off
<Proxy *>
Order Allow,Deny
Allow from all
</Proxy>
# Pass requests to puma
ProxyPass / http://127.0.0.1:8090/
ProxyPassReverse / http://127.0.0.1:8090/
</VirtualHost>
The upstream is a Puma service running Ruby on Rails/Spree.
When I access the store root path through Apache (http://store.com:8000/store/) or directly through Puma (http://store.com:8090/store/) it works perfectly for both. The Content-Type header of the response is set to text/html; charset=utf-8.
When I access the admin page directly through Puma on port 8090 (http://store.com:8090/store/admin/orders/) it works perfectly too, and sends me these headers:
HTTP/1.1 200 OK
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Referrer-Policy: strict-origin-when-cross-origin
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rel=preload; as=script; nopush,</assets/spree/backend/zone.self-52966ad40be27143d046936c2da8e9b688eb539d47baf7ee17864db179df6414.js?body=1>; rel=preload; as=script; nopush,</assets/spree/backend/all.self-ac4347b135ab8935f2dd20089f2acc8bec1d6b2ad528a80fcb03cd445dbd4d27.js?body=1>; rel=preload; as=script; nopush,</assets/select2_locale_en.self-9fe9edd5fbbdf7151ed20459f39a1c3d9cdce1916c0d04737620f998439e784f.js?body=1>; rel=preload; as=script; nopush,</assets/flatpickr/l10n/default.self-b39e1a541baf193385a84738d77c5a54c7dd5c3117fbcc26f3550f6203a295b7.js?body=1>; rel=preload; as=script; nopush
Content-Type: text/html; charset=utf-8
ETag: W/"a3b88ca70f8ab4b247de5554fb498e8e"
Cache-Control: max-age=0, private, must-revalidate
Set-Cookie: _store_session=0%2BIVGpmBrXrpvnyAk%2FqtG73t2M1TBFW3ZU1fwnsjbLujGgjFyKbWkv3KXsvaw1y23DOQ4mIlz8kapr58%2F8%2FqrxGdWtPtsFrHi6DugfIMvlnh7OGo2aO57bLOGn%2FSNF5lFxvYWc9NSqb0EGwaTBozlkj9OxV1tmYNvjH95kBR2U3tcHutdcB9r%2FRORZhquLFKuQeC%2B9WDwwmzRVGNfJ%2BR18gjl0tGQ%2BrnGsVTEiUtRZ6J%2Bk57TuJNocY%2BtbDpnbrBrMXjtM5Eq9kKYMTO4NR3YRHdJLkyfc1b02WeTKVAQeqk0DxpFxq2Tq9ksMyxAipKWgelE%2BbfrOVk3w5Eqze7pS%2FlLrRBDPGBrSsuCOkUZ6trnkuDG0kftQzcGgJP158Q0J9RU5zudjY0kxqJapFyZ0SxWJ%2BXPxH6Cke4SAIgzDu%2BkqXZSxtLzr3kzleyvEUhUH6dtT1XtqBLilrH79AheIRAgXBblQyyFgOnaBw753hToZjCCMiuTB1BRaA%3D--RNKCVv76Uu%2Bq8DRC--fIsT9BMj2fnOAcHf9%2BNxSA%3D%3D; path=/; HttpOnly; SameSite=Lax
X-Request-Id: 60bd6bca-2fd2-431d-8d88-f2b7601cea34
X-Runtime: 0.326021
Transfer-Encoding: chunked
Notice that the Content-Type is present.
But when I access the same page (or any other under /store/admin/) through Apache (http://localhost:8000/store/admin/orders/), I get this instead:
HTTP/1.1 200 OK
Date: Thu, 25 Feb 2021 09:17:27 GMT
Server: Apache/2.4.29 (Ubuntu) OpenSSL/1.1.1
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Referrer-Policy: strict-origin-when-cross-origin
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Keep-Alive: timeout=300, max=200
Connection: Keep-Alive
Transfer-Encoding: chunked
There's no Content-Type, so the browser tries to download it.
Any idea what could be the cause of this?
Edit: I noticed that the Link header is enormous and was being truncated by Apache, so I added Header unset Link to my vhost config. It's not sent anymore, but the problem persists.
Found the problem.
Rails recently started sending a Link header with all assets so the browser can preload them. See this PR.
The problem is that in development that header can get pretty big (as was the case with my admin page). Puma worked fine with the giant header, but Apache was truncating the headers to 8 KiB (of which 7.58 was the truncated Link header) and not sending a complete response, hence the missing Content-Type.
I simply disabled the feature in Rails (see this PR) by adding this to config/environments/development.rb:
config.action_view.preload_links_header = false
And restarting the server.
This is unlikely to be a problem in production since assets usually get precompiled and concatenated.