REST API bulk contact search using request body

Hi, I’m trying to call the Mautic 4.3 REST API using bash curl to find if a list of emails exist as contacts, but I seem to be hitting some kind of hard limit, because Mautic instantly returns an HTTP 503: Service Unavailable.

It works if I try with a handful of email addresses, but since my actual search list is very long I suspect this is due to the fact that I’m using a GET query string to send the search list, as exemplified in Mautic Developer Documentation :

curl -gkX GET \
     -H "Content-Type: application/json"   \
     -H "Authorization: Basic $(echo -n 'user:password' | base64)"  \

So my question is: is there a way to send a list of emails to search via REST API using the request body instead of the query string?

Uh, I guess it was just a matter of sending the same query string inside the request body instead of using the URL. Sorry for the dumb question.