I have created a plugin for wordpress but I don't understand what an "arbitrary URL" is. Here's what I've found:
When installed, the plugin has to make a custom endpoint available on the site of WordPress. By "custom endpoint" we refer to an arbitrary URL not recognized by WP as a Standard URL, like a permalink or so. Please note that this is not a point of REST connection. When a visitor navigates to that endpoint, the plugin has to send a request HTTP to a REST API endpoint. The API is available at https: // jsonplaceholder. typicode.com/ and the connection point you are going to to call is / users. The plugin will parse the JSON response and use it to create and display a table HTML.
I would like you to tell me what this arbitrary URL is and clarify the question in general please.