Edge SEO uses CDN rules and lightweight serverless functions to adjust headers, routing, and caching close to users. Prioritize parity with served HTML and use reversible rules for fast testing without risking cloaking.
Which header is commonly used to instruct browsers to fetch critical assets early?
Content‑Language for fonts
Alt‑Svc for HTML parsing
Link: rel=preload for high‑priority resources
Vary: User‑Agent to disable caching
A safe use of edge functions for SEO is to ______.
cloak different markup to bots vs. users
inject content unseen by users into HTML for ranking
enforce consistent redirects (e.g., trailing slash or canonical host) at the CDN edge
rewrite all titles based on referrer alone
Which caching directive helps keep sites responsive during origin issues?
must‑revalidate on every request
no‑store on all assets
Cache‑Control: never
stale‑while‑revalidate or stale‑if‑error in Cache‑Control
Why is parity important when injecting structured data at the edge?
Search ignores schema entirely
Edge JSON‑LD must be Base64 encoded
JSON‑LD requires HTTP/2
Schema that doesn’t reflect user‑visible content risks cloaking and rich result loss
What’s a practical KPI pair for edge‑rule programs?
Quantity of HTML comments added
Redirect error rate and cache hit ratio for targeted routes
Count of blocked IPs only
Number of POPs and logo size
Which security header is most directly SEO‑safe to add at the edge?
Strict‑Transport‑Security (HSTS) to enforce HTTPS
Content‑Security‑Policy that blocks inline scripts needed for UX
X‑Robots‑Tag: noindex on all pages
Referrer‑Policy: no‑referrer on product pages only
Early Hints (HTTP 103) can improve performance by ______.
allowing the browser to start fetching hints before the final response
turning off compression
forcing a full page reload
removing caching rules
Which edge change is most likely to harm SEO if misused?
Adding immutable to long‑lived assets
Blocking crawlers via User‑Agent rules at the CDN
Serving Brotli for text assets
Normalizing www vs apex redirects
To vary content responsibly at the edge, you should ______.
send a precise Vary header (e.g., Vary: Accept‑Language) when content differs by signal
strip all Vary headers globally
use Vary: * on HTML
vary on random headers to fragment caches
Why are lightweight serverless scripts preferred at the edge for SEO tasks?
They automatically increase keyword density
They minimize latency and reduce cold‑start penalties versus heavy origin logic
They guarantee a 100% Core Web Vitals score
They remove the need for sitemaps
Starter
Starter: Use safe headers and consistent redirects; avoid any bot‑only changes.
Solid
Solid: Tune cache directives and preloads; validate parity for structured data.
Expert!
Expert: Automations, guardrails, and observability keep edge changes fast and reversible.
