[openstreetmap/openstreetmap-website] Certain Static (?) files can never receive a 304 Not Modified (#2262)
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Sun Jun 16 20:49:18 UTC 2019
Conducting a simple refresh (f5) on a recently downloaded [test map page](https://www.openstreetmap.org/way/17236956) causes only half (10 out of 21) of the files to give a `304 Not Modified`. Obviously *Not Good* both for the user (slow) plus OSM (increased bandwidth + load).
Some of those files may well be dynamic, but some are clearly static. Because of the wide range of *Response Header* symptoms + my ignorance these are individual filetype reports to allow those with a working knowledge of the code to decipher it all. Please also note that since these tests the [`Last-Modified` value](https://github.com/openstreetmap/operations/issues/305) has been re-enabled & `eTag` disabled.
A disparate bunch of (probably) static files.
- 3 x CSS
- 1 x GIF
- 3 x JS
- 7 x PNG
- 2 x SVG
- `Last-Modified`: not present
- `eTag`: not present
- `Expires`: Mon, 15 Jun 2020 13:46:41 GMT
- Request: (no IM, INM, IMS, etc. so no 304)
The tiles supplied by *toothless* (eg https://b.tile.openstreetmap.org/18/130245/85447.png) are all dynamic yet all have a strong `eTag` (matched by the `If-None-Match`) + `Expires` and thus get cached + a 304.
See bottom of [this Diary page](https://www.openstreetmap.org/user/alexkemp/diary/368814) for fuller details.
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