shift urlPrefix defn up to enable early-stage error pages
shift urlPrefix defn up to enable early-stage error pages

PrairieLearn/PrairieLearnHack,PrairieLearn/PrairieLearnHack,lotrfan/PrairieLearn,rbessick5/PrairieLearn,PrairieLearn/PrairieLearnHack,kevinwang/PrairieLearn,PrairieLearn/PrairieLearnHack,parasgithub/PrairieLearn,parasgithub/PrairieLearn,jakebailey/PrairieLearn,tbretl/PrairieLearn,lotrfan/PrairieLearn,mwest1066/PrairieLearn,rbessick5/PrairieLearn,lotrfan/PrairieLearn,lotrfan/PrairieLearn,lotrfan/PrairieLearn,tbretl/PrairieLearn,jakebailey/PrairieLearn,rbessick5/PrairieLearn,parasgithub/PrairieLearn,kevinwang/PrairieLearn,jakebailey/PrairieLearn,tbretl/PrairieLearn,kevinwang/PrairieLearn,tbretl/PrairieLearn,mwest1066/PrairieLearn,kevinwang/PrairieLearn,PrairieLearn/PrairieLearnHack,PrairieLearn/PrairieLearnHack,lotrfan/PrairieLearn,rbessick5/PrairieLearn,kevinwang/PrairieLearn,mwest1066/PrairieLearn,parasgithub/PrairieLearn,PrairieLearn/PrairieLearnHack,kevinwang/PrairieLearn,parasgithub/PrairieLearn,jakebailey/PrairieLearn,PrairieLearn/PrairieLearnHack,mwest1066/PrairieLearn,mwest1066/PrairieLearn,lotrfan/PrairieLearn,rbessick5/PrairieLearn,kevinwang/PrairieLearn,tbretl/PrairieLearn