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17 lines
397 B
17 lines
397 B
3 years ago
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'use strict'
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const append = require('vary').append
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// https://github.com/fastify/fastify-sensible/blob/master/lib/vary.js
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module.exports = function vary (reply, field) {
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let value = reply.getHeader('Vary') || ''
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const header = Array.isArray(value)
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? value.join(', ')
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: String(value)
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// set new header
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if ((value = append(header, field))) {
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reply.header('Vary', value)
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}
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}
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