SEO finding
On a Windows server, the same page answers under every capitalisation of its address
SEO Warning Severity: Medium
Part of the audit Several URLs each claim to be the page. Finding id: seo.urlCaseVariantsOnIis.
What it costs you
Links written with different capitals count as different pages, and search engines may index more than one of them.
What to do
Give every page a canonical tag with its one correct address, or redirect other capitalisations to it.
What it checks
- Page works in upper and lower case
How to fix it
Settle on one capitalisation
- Add a canonical tag with the lower-case address to every page template.
- Optionally redirect other capitalisations to the lower-case address with the server's URL rewriting.
How to check: Request the page with different capitals: it redirects, or its canonical tag names the lower-case address.
How to verify by hand
Search Console: several capitalisations of the same address with impressions.
What this relies on
On a case-insensitive server every capitalisation of an address is a working copy of the page.