Webflow + GCLB (Advanced DNS): How to avoid duplicate content & SEO issues with subdomain workaround?

Hi everyone,

We’re using Google Cloud Load Balancer (GCLB) to manage traffic to our domain and recently followed Webflow’s advice to publish our site to a temporary subdomain (e.g. wf . domain . com) due to the new DNS requirements.

Why we did this:

We can’t point www .domain.com directly to Webflow, since it’s behind a load balancer handling other services too.

To comply with Webflow’s new hosting requirements (and keep publishing updates before Nov 3), we:

  • Created a temporary subdomain (wf .domain.com)

  • Pointed it directly to Webflow (non-proxied DNS)

  • Published the site to this subdomain

  • Routed external traffic from www .domain.com to wf .domain.com via GCLB

It works technically.

But it creates two public URLs for every page:

  • wf . domain . com/page

  • www . domain . com/page

Known issue:

We know this creates duplicate content, which will cause SEO issues (split rankings, crawl budget, etc.), especially for our main site.

Questions for the community:

  1. Has anyone implemented a clean setup using Webflow + reverse proxy (like GCLB or Cloudflare) that avoids duplicate URLs entirely?

  2. Is it possible to 301 redirect all wf. domain. com/ → www. domain. com/ without causing redirect loops due to the proxy layer? Has anyone pulled this off cleanly via GCLB or another method?**

  3. We can add canonical tags pointing to www. domain. com, but is that enough to preserve SEO performance?

  4. Any tips on blocking the temporary subdomain (wf. domain. com) from indexing without affecting the live site on Webflow? (Webflow robots.txt affects all domains)

What we’re looking for:

An approach that:

  • Lets us keep using GCLB as a proxy

  • Keeps Webflow happy (CNAME/SSL setup)

  • Ensures only www. domain. com gets indexed and ranked

Anyone in the Webflow community implemented something like this before?

We’d love to hear how you handled it or what long-term solution you’d recommend.

Thanks in advance,

Jean-Baptiste

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