Function setClientErrorHandler

packages/vite/src/node/http.ts:271–307

(
  server: HttpServer,
  logger: Logger,
)

}

export function setClientErrorHandler(
  server: HttpServer,
  logger: Logger,
): void {
  server.on('clientError', (err, socket) => {
    // https://github.com/nodejs/node/blob/v26.2.0/lib/_http_server.js#L992
    let msg
    switch ((err as any).code) {
      case 'HPE_HEADER_OVERFLOW': {
        msg = '431 Request Header Fields Too Large'
        logger.warn(
          colors.yellow(
            'Server responded with status code 431. ' +
              'See https://vite.dev/guide/troubleshooting.html#_431-request-header-fields-too-large.',
          ),
        )
        break
      }
      case 'HPE_CHUNK_EXTENSIONS_OVERFLOW': {
        msg = '413 Payload Too Large'
        break
      }
      case 'ERR_HTTP_REQUEST_TIMEOUT': {
        msg = '408 Request Timeout'
        break
      }
      default: {
        msg = '400 Bad Request'
        break
      }
    }
    if ((err as any).code === 'ECONNRESET' || !socket.writable) {
      return
    }
    socket.end(`HTTP/1.1 ${msg}\r\nConnection: close\r\n\r\n`)
  })
}