Domain Notes

Updated Jun 18, 2026 1 min read

Domain notes clean protocol-prefixed URL strings into bare hostnames. Use them in normalize: blocks where spec fields may arrive as "https://acme.com/", "http://acme.com", or already-clean "acme.com". Both functions are pure, idempotent, and nil-safe.

Reference

Note	Description
`domainHost`	Strip surrounding whitespace, `https://` or `http://` prefix, and trailing `/`.
`domainBare`	Same as `domainHost`, and also strips a leading `www.

Examples

# domainHost
normalize:
  spec:
    domain: '{{ domainHost .spec.domain }}'
# "https://acme.example.com/" → "acme.example.com"
# " http://acme.example.com " → "acme.example.com"
# "acme.example.com"          → "acme.example.com"
domain: '{{ trimSuffix (domainHost .spec.domain) ":8080" }}'
# "https://acme.example.com:8080/" → "acme.example.com"
{{ trimSuffix (trimPrefix (trimPrefix (trimSpace .spec.domain) "https://") "http://") "/" }}

# domainBare
normalize:
  spec:
    domain: '{{ domainBare .spec.domain }}'
# "https://www.acme.com/" → "acme.com"
# "https://acme.com/"     → "acme.com"
# "www.acme.com"          → "acme.com"
# "acme.com"              → "acme.com"