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Fixed in Unity 2018.1



Found in


Issue ID




[WebGL] <Build>.data.unityweb is not cached in the Indexed DB




Priority: 2Necessary for shipping a final release


Severity: 3Workaround is possible

Steps to reproduce:

1) Download attached project '' and open in Unity
2) Build attached project
3) Install XAMPP
Download XAMPP from here:
4) Create folder and rename it to 'Cache' in C:\xampp\htdocs
5) Add built project in recently created 'Cache'' folder
6) Launch XAMPP's Control Panel
7) Start Apache module
8) Open Firefox browser and enter: http://localhost/Cache/index.html
9) In the browser, click on Developer settings >> Web Console(Firefox)
If you can't see the Storage tab, click on the gear icon and enable Storage developer tool(Firefox)
10) In the Storage tab, expand whole Indexed DB tab
11) Click on FILE_DATA folder
There is no cached <Build>.data.unityweb in the Indexed DB

Expected result: There should be <Build>.data.unityweb cached in the Indexed DB
Actual result: There is no cached data of <Build>.data.unityweb in the Indexed DB (check attached image 'NoStoredData.unityweb.png')

Reproduced with:
5.6.3f1, 2017.1.0p3, 2017.2.0b6, 2071.3.0a3

Tested with:
Mozilla Firefox 54.0.1
Google Chrome Version 60.0.3112.90 (Official Build) (64-bit)

Fixed in: 2018.1.0a3

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