@Calle_Hedberg, I once asked in this post https://community.dhis2.org/t/best-optimal-configuration-in-terms-of-software-requirement-versions-for-a-dhis2-2-30-on-ubuntu-16-04/35292
what the best/optimal settings in terms of software requirments would be and you noted something critical - Tomcat 8.5.x (I have not tested Tomcat 9), just remember to include the relaxQueryParameter setting to disregard the use of square brackets if you use build 8.5.35. I vote that this be included in documentation. Am sure many will still run into this
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