Fix: Allow caching WP Rest API when helper plugin is activated.

[jeawhanlee]

Description

Return early when when WP Rest API is accessed and helper plugin is activated.

Fixes #5900

Type of change

• Bug fix (non-breaking change which fixes an issue)

Is the solution different from the one proposed during the grooming?

No

How Has This Been Tested?

Manual

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings

[vmanthos]

@jeawhanlee @piotrbak This is working as expected. 👍

A possible implication of the current PR is that redirects to add or remove the trailing / won't take place when wp-json is included in the URI. For example, for a post titled "What is /wp-json?" the URI will be https://example.com/what-is-wp-json.

Is there something we can/should do about this?

[piotrbak]

@vmanthos We're good here, thanks!