REST POST without input content only url with parameters

please kindly sent me pipeline example where i need to post to rest without any content.

i just need to send url to REST post to merge account in marketo

e.g:
https://test-mktorest.com/rest/v1/leads/1934/merge.json?access_token=TOKEN]&leadIds=1888,1839

//1934- i will add dynamically
i dont have any input message or anything. please kindly advice how to sent.

what content type to use. I tried '“application/x-www-form-urlencoded” but it throwd invalid content type. please kindly suggest some solution.