headRouteOnSendHandler() — fastify Function Reference

Architecture documentation for the headRouteOnSendHandler() function in head-route.js from the fastify codebase.

Function javascript CoreKernel LifecycleManager

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CoreKernel→ LifecycleManager→ headRouteOnSendHandler() — fastify Function Reference

Dependency Diagram

graph TD
  eb3ef7fb_2278_d4d5_26a3_22f1829a5231["headRouteOnSendHandler()"]
  c5facddc_8288_c141_71d8_5c9489d349b1["head-route.js"]
  eb3ef7fb_2278_d4d5_26a3_22f1829a5231 -->|defined in| c5facddc_8288_c141_71d8_5c9489d349b1
  style eb3ef7fb_2278_d4d5_26a3_22f1829a5231 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

lib/head-route.js lines 2–34

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)
}