Firebase Hosting not compressing image files

[Colin McDonnell]

Hi there,

My Firebase Hosting project isn't compressing image assets. This SO post says Hosting automatically gzips files, but it's not happening

Here's a sample image: https://dpcspotweb.firebaseapp.com/img/pills.jpeg. Here are the headers of the asset:

HTTP/1.1 200 OK

Server: nginx

Content-Type: image/jpeg

Cache-Control: max-age=3600

Strict-Transport-Security: max-age=31556926; includeSubDomains; preload

ETag: "79cac4008854f4589e18d57564d1226c"

Last-Modified: Fri, 22 Dec 2017 02:20:04 GMT

Content-Length: 102277

Accept-Ranges: bytes

Date: Fri, 22 Dec 2017 03:16:53 GMT

Via: 1.1 varnish

Connection: keep-alive

X-Served-By: cache-dca17738-DCA

X-Cache: HIT

X-Cache-Hits: 1

X-Timer: S1513912614.715824,VS0,VE1

Any thoughts?

Incidentally, I also would like image compression on Firebase Storage files but I'm not getting that either. (sample link)

Colin

[Michael Lehenbauer]

Somebody else may be able to chime in more authoritatively, but I believe it's standard practice to avoid gzipping already-compressed files like jpeg images, since the extra layer of compression saves little (try gzipping a jpeg and you'll see), but it still adds extra decompression overhead so it makes things slower over all.

Hope this makes sense,

-Michael

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[Alex Memering]

Michael is correct, Firebase Hosting serves most files gzipped, but not image files because in most circumstances gzipping does not provide much if any additional compression.  The most common approach is to compress the images yourself to your liking, you can pick the tradeoffs that make sense for you.  Another option is to serve multiple different sizes and have your application choose which one to load.

As for Firebase Storage my understanding is that if you upload the file gzipped then it will be served gzipped (although you can request the raw file).  If you upload the file with any other compression then you can only get the file the way you uploaded it (Firebase Storage will not try to gzip it for you).

Hope that helps,

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Alex Memering |

Software Engineer |

meme...@google.com