Canonical Tag in HTML and HTTP Header

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Quick Reference

Element Code: IN-020

Issue: Canonical specified in both HTML meta and HTTP header

Impact: Potential for conflicts if they differ; redundant if identical

Fix: Use one method consistently; ensure they match if using both

Detection: Screaming Frog, HTTP header inspection

What Is This Issue?

Canonical tags can be specified in HTML or via HTTP header. Using both is acceptable but creates potential for conflicts. If they differ, behavior is unpredictable.

Why This Matters for Your Website

Conflicting canonicals from different sources can cause unpredictable indexation. Consistent approach is safer.

How to Fix This Issue

  1. Check for conflicts: Compare HTML and header canonicals
  2. If different: Fix to match or remove one
  3. If same: Consider removing one for simplicity

Tools for Detection

  • Screaming Frog: Shows both canonical sources

TL;DR (The Simple Version)

You have canonicals in both HTML and HTTP headers. Make sure they match, or pick one method and remove the other.

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