Several URLs each claim to be the page

Checks

• Page works with and without a trailing slash trailing_slash_variants_both_200
• Page works in upper and lower case case_variants_both_200
• Address variants each name themselves preferred parameter_variants_self_canonical
• Page works over both HTTP and HTTPS http_and_https_both_200
• Page works with and without www www_and_non_www_both_200
• Mobile version not linked to main page mobile_or_amp_variant_without_pairing
• Print or session versions can be indexed print_or_session_variants_indexable

Findings

• On a Windows server, the same page answers under every capitalisation of its address
• Two spellings of the same URL both answer 200 and neither points to the other
• A mobile, AMP, print or session version of a page is not tied to the main page

What this relies on

The variant with the most internal links is the intended one.

How to verify by hand

Search Console impressions split across the variants.