What are you trying to achieve or the steps to reproduce?

I would like to know how to capitalize headers when sending the response. Looks like Fastify converts the headers to lowercase while sending the response.

reply.header(`X-Robots-Tag`, `noindex`);

What was the result you received?

x-robots-tag: noindex

What did you expect?

X-Robots-Tag: noindex

Context

• node version: v10.15.3
• fastify version: 2.1.0
• os: Mac
• any other relevant information: None