Sets headers directly on the raw Node.js http.ServerResponse. Unlike headers set via Fastify's
response.header(), these survive response.hijack() because they are written to the underlying
Node response. When an endpoint later calls writeHead(), these headers are merged in, with
writeHead() headers taking precedence.
Sets headers directly on the raw Node.js
http.ServerResponse. Unlike headers set via Fastify'sresponse.header(), these surviveresponse.hijack()because they are written to the underlying Node response. When an endpoint later callswriteHead(), these headers are merged in, withwriteHead()headers taking precedence.