Individual skill
lowercase
Use when auditing URL structure or configuring a new site's routing. Applies to any server or framework that allows case-insensitive file systems (Linux servers are case-sensitive by default).
skills/lowercase/SKILL.md
Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e
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- Observed behavior
- Instructions only
- Last checked
- Nov 9, 2026
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- 74,709
- Repository last updated
- Oct 31, 2026
- License
- MIT
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- frontend Repository topic
- front-end-development Repository topic
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- checklist Repository topic
- reference Repository topic
- web-development Repository topic
- html Repository topic
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- engineering Derived category
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SKILL.mdcore · 2,160 bytesreferences/rule.mddoc · 4,120 bytes
Read excerpt
# Use lowercase URLs
Mixed-case URLs can create duplicate content—search engines may index both /Product and /product as separate pages, splitting link equity and diluting rankings.
## Quick Reference
- URLs should be entirely lowercase to prevent duplicate content issues
- Most web servers treat /Page and /page as different URLs, creating duplicates
- Redirect uppercase and mixed-case URLs to their lowercase equivalents with 301
- Apply lowercasing in your server config or framework router, not ad hoc
## Check
Scan the site's internal links and server-side routes for URLs containing uppercase letters. Check HTTP response codes for uppercase variants of key URLs to confirm whether they redirect (301) to lowercase.