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Astro.response.headers must not be reassigned.

src/content/docs/en/reference/errors/astro-response-headers-reassigned.mdx

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Original Source

import DontEditWarning from '~/components/DontEditWarning.astro'

<DontEditWarning />

AstroResponseHeadersReassigned: Individual headers can be added to and removed from Astro.response.headers, but it must not be replaced with another instance of Headers altogether.

What went wrong?

Thrown when a value is being set as the headers field on the ResponseInit object available as Astro.response.