AJAX request URL routing

This strikes me as somewhat similar to this question

I've got an AJAX request on my page, and the pag开发者_开发技巧e location is /a/b/c. I want to send the request to d. Sending it to /d or to a/b/d I can do. However, I need to route it to a/b/c/d. How do I do that?

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Use the current page url and append /d to it.

eg.

var urlToUse = location.href + "/d";