PixivFE/doc/dev/framework-migration.md

Migrating from gofiber to net/http -- the plan

Templating

First, convert all c.Render("about", ...) to Render(c, Data_about{...}. Then, the templating engine is decoupled from gofiber.

Fixing current templates

If you see error like <variable name> not found in map[...] when visiting a page, you need to add a dot before all data member access. e.g. from Illust to .Illust.

gofiber doesn't mention this. In Jet, variables are accessed without a dot (PageURL), while data members (the data parameter to Render(...)). are accessed with a dot in front.

Current templates use the variable style (Illust), but that is wrong.