Maybe there's a trick here I don't know about, because I know almost nothing about cache control, but from where I'm standing it looks like the server is just straight-up lying, and it's stopping things from updating in a timely manner.
I noticed changes to .js files were taking quite a while to actually be reflected when I visit an associated page to see if they're working okay, and I started examining my headers with Fiddler.
So if I navigate directly to CommonFunctions.js in a web browser right now I have this in my request header:
If-Modified-Since: Mon, 09 Jan 2017 22:43:24 GMT
and I get this in the response header:
Last-Modified: Mon, 09 Jan 2017 22:43:24 GMT
...and in my browser I see an outdated version of the file.
Now I can check in file manager and see that actually the file was last updated Today at 3:27pm. (Today is Wednesday, Jan 11)
Setting aside for a moment and time zone issues, this is clearly not the same value. (If I open the file from the control panel and look inside it's the updated file).
I'm fairly certain this is not a matter of the browser caching the wrong file, because If I send a copy of the GET request through Postman it shows me the exact same thing Fiddler and a web browser did. (An outdated file with an incorrect last-modified time)
EVENTUALLY these things do update, but it seems to take half and hour to an hour from when I updated the file.
This only happens with certain file types. Changes to .php files are visible to a browser within a few seconds of my making them.
I noticed changes to .js files were taking quite a while to actually be reflected when I visit an associated page to see if they're working okay, and I started examining my headers with Fiddler.
So if I navigate directly to CommonFunctions.js in a web browser right now I have this in my request header:
If-Modified-Since: Mon, 09 Jan 2017 22:43:24 GMT
and I get this in the response header:
Last-Modified: Mon, 09 Jan 2017 22:43:24 GMT
...and in my browser I see an outdated version of the file.
Now I can check in file manager and see that actually the file was last updated Today at 3:27pm. (Today is Wednesday, Jan 11)
Setting aside for a moment and time zone issues, this is clearly not the same value. (If I open the file from the control panel and look inside it's the updated file).
I'm fairly certain this is not a matter of the browser caching the wrong file, because If I send a copy of the GET request through Postman it shows me the exact same thing Fiddler and a web browser did. (An outdated file with an incorrect last-modified time)
EVENTUALLY these things do update, but it seems to take half and hour to an hour from when I updated the file.
This only happens with certain file types. Changes to .php files are visible to a browser within a few seconds of my making them.
