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backend/node_modules/fastify/lib/head-route.js

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+'use strict'
+function headRouteOnSendHandler (req, reply, payload, done) {
+  // If payload is undefined
+  if (payload === undefined) {
+    reply.header('content-length', '0')
+    done(null, null)
+    return
+  }
+
+  // node:stream
+  if (typeof payload.resume === 'function') {
+    payload.on('error', (err) => {
+      reply.log.error({ err }, 'Error on Stream found for HEAD route')
+    })
+    payload.resume()
+    done(null, null)
+    return
+  }
+
+  // node:stream/web
+  if (typeof payload.getReader === 'function') {
+    payload.cancel('Stream cancelled by HEAD route').catch((err) => {
+      reply.log.error({ err }, 'Error on Stream found for HEAD route')
+    })
+    done(null, null)
+    return
+  }
+
+  const size = '' + Buffer.byteLength(payload)
+
+  reply.header('content-length', size)
+
+  done(null, null)
+}
+
+function parseHeadOnSendHandlers (onSendHandlers) {
+  if (onSendHandlers == null) return headRouteOnSendHandler
+  return Array.isArray(onSendHandlers)
+    ? [...onSendHandlers, headRouteOnSendHandler]
+    : [onSendHandlers, headRouteOnSendHandler]
+}
+
+module.exports = {
+  parseHeadOnSendHandlers
+}