Function handleRequest

packages/next/src/server/lib/router-server.ts:371–697

(handleIndex: number)

    }

    const handleRequest = async (handleIndex: number) => {
      if (handleIndex > 5) {
        throw new Error(`Attempted to handle request too many times ${req.url}`)
      }

      // handle hot-reloader first
      if (development) {
        if (
          blockCrossSiteDEV(
            req,
            res,
            development.config.allowedDevOrigins,
            opts.hostname
          )
        ) {
          return
        }

        const origUrl = req.url || '/'

        // both the basePath and assetPrefix need to be stripped from the URL
        // so that the development bundler can find the correct file
        if (config.basePath && pathHasPrefix(origUrl, config.basePath)) {
          req.url = removePathPrefix(origUrl, config.basePath)
        } else if (
          config.assetPrefix &&
          pathHasPrefix(origUrl, config.assetPrefix)
        ) {
          req.url = removePathPrefix(origUrl, config.assetPrefix)
        }

        const parsedUrl = parseUrlUtil(req.url || '/')

        const hotReloaderResult = await development.bundler.hotReloader.run(
          req,
          res,
          parsedUrl
        )

        if (hotReloaderResult.finished) {
          return hotReloaderResult
        }

        req.url = origUrl
      }

      const {
        finished,
        parsedUrl,
        statusCode,
        resHeaders,
        bodyStream,
        matchedOutput,
      } = await resolveRoutes({
        req,
        res,
        isUpgradeReq: false,
        signal: signalFromNodeResponse(res),