Technical SEO

Edge SEO

Quick Definition

Edge SEO is the practice of running SEO logic (redirects, header injection, schema insertion, A/B tests) at the CDN edge rather than in the origin web server.

In context

Edge SEO uses platforms like Cloudflare Workers, Akamai EdgeWorkers, and Fastly Compute to ship SEO changes without engineering deployments. Common use cases: emergency redirect changes, hreflang tag injection on legacy CMSes, conditional schema insertion, A/B testing canonical tags, geographic content variations. The advantage is speed — edge changes deploy globally in seconds versus engineering sprint cycles. The risk is that edge logic can drift from origin logic and cause subtle bugs.

Example

A Canadian ecommerce site stuck on a slow legacy platform uses Cloudflare Workers to inject hreflang tags for fr-CA / en-CA on every page — shipping in a day what would have taken the platform team a quarter.

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Related terms

302 Redirect

A 302 redirect is a temporary redirect that tells search engines the move is not permanent.

Breadcrumbs

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CLS (Cumulative Layout Shift)

CLS measures unexpected visual movement during page load. The 'good' threshold is under 0.1.

Indexation

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SSL Certificate

An SSL certificate is the cryptographic credential that enables HTTPS by encrypting traffic between browser and server.

Microdata

Microdata is an older format for adding structured data inline in HTML using itemprop and itemscope attributes.

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