Cloudflare Developers•3w ago

Local development proxy example getting a middleware error

Hey all, I'm having this issue trying to create a worker that will work as a reverse proxy for 2 applications. Here is the simplified logic I am using:

export default {

  async fetch(req): Promise<Response> {
    const incomingUrl = new URL(req.url)
    const handler = await buildRequestHandler(req)
    return handler(TARGET_DOMAIN)
  },
} satisfies ExportedHandler<Env>

async function buildRequestHandler(req: Request) {
  const url = new URL(req.url)
  const incomingOrigin = req.headers.get('Referer') ?? new URL(req.url).origin

  return async (newOrigin: string) => {
    const targetUrl = url.toString().replace(
      incomingOrigin,
      newOrigin,
    )

    return fetch(targetUrl, {
      headers: {
        ...req.headers,
        'EXTRA-HEADER': 'FOO'
      },
    })
  }
}

export default {

  async fetch(req): Promise<Response> {
    const incomingUrl = new URL(req.url)
    const handler = await buildRequestHandler(req)
    return handler(TARGET_DOMAIN)
  },
} satisfies ExportedHandler<Env>

async function buildRequestHandler(req: Request) {
  const url = new URL(req.url)
  const incomingOrigin = req.headers.get('Referer') ?? new URL(req.url).origin

  return async (newOrigin: string) => {
    const targetUrl = url.toString().replace(
      incomingOrigin,
      newOrigin,
    )

    return fetch(targetUrl, {
      headers: {
        ...req.headers,
        'EXTRA-HEADER': 'FOO'
      },
    })
  }
}

Here is the errors I am getting locally:

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Local development proxy example getting a middleware error