Caddy: How can put this character to header?

[p0we7]

I want to put the following code inside the header to achieve the effect shown below.
I tried adding the code to Caddyfile and got an error when I run the Caddy server.

loading module 'headers': provision http.handlers.headers: replacement 0 for header field 'moomin00': error parsing regexp: missing closing ]: `[38;5;237m▄%1b[38;5;235m▄%1b[49m

[francislavoie]

Well that's a wacky usecase if I've ever seen one.

I figure you didn't wrap the value in double quotes or in backticks so Caddy read it as multiple separate tokens.

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[mholt]

Ha, I kinda love this idea.

[mholt]

For anyone finding this, the solution is here: https://caddy.community/t/how-can-put-this-character-to-header/9317/5?u=matt

Go strips leading whitespace in header values (sad face) so you can trick it by inserting a non-breaking space character at the start of each line.