no-server-trailing-slash

Disallows a trailing slash in an OpenAPI server URL.

Attribute	Value
Category	Metadata
Maturity	Baseline
OpenAPI	OpenAPI 3.0, 3.1, 3.2
All rulesets	Error

Intent

Joining a slash-terminated base URL to a slash-prefixed path can produce duplicate separators and inconsistent request URLs.

Flags

An object-valued server whose textual url is longer than one character and ends with /.

Does not flag

The single-character URL /, URLs without a trailing slash, non-string URLs, or non-object server entries.

See it fail

servers:
  - url: https://api.example.test/v1/

Diagnostic: Server `url` should not have a trailing slash.

Fix it

servers:
  - url: https://api.example.test/v1

Configure

profiles:
  default:
    rules:
      extends: [recommended]
      override:
        no-server-trailing-slash: warn

Nearby: no-path-trailing-slash, no-empty-servers.