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Is a template is must in v1.6?

Is a template is must in v1.6?: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). I use c.Ctx.Output.Body() direct write reponse , it works in beego v1.5 . But wrong in beego v1.6

The task

I use c.Ctx.Output.Body() direct write reponse , it works in beego v1.5 . But wrong in beego v1.6

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.