[Help] curl - Empty reply from server

I'm trying to send a post request to a website via curl on my AWS Ec2 instance (Linux AMI), but I am receiving an empty response. I am able to successfully run the request locally (i.e. on my personal computer), which returns a text/html response. I've tried running this request with a Node js app, and making the post request in my Ec2 instance fails with a Socket Hang Up error. Again, this works locally.

The verbose output of the curl in Ec2 is below. Any ideas what would be causing the empty response?

* ALPN, offering h2

* ALPN, offering http/1.1

* successfully set certificate verify locations:

* CAfile: /etc/ssl/certs/ca-certificates.crt

CApath: /etc/ssl/certs

* TLSv1.3 (OUT), TLS handshake, Client hello (1):

* TLSv1.3 (IN), TLS handshake, Server hello (2):

* TLSv1.3 (OUT), TLS change cipher, Client hello (1):

* TLSv1.3 (OUT), TLS handshake, Client hello (1):

* TLSv1.3 (IN), TLS handshake, Server hello (2):

* TLSv1.3 (IN), TLS Unknown, Certificate Status (22):

* TLSv1.3 (IN), TLS handshake, Unknown (8):

* TLSv1.3 (IN), TLS Unknown, Certificate Status (22):

* TLSv1.3 (IN), TLS handshake, Certificate (11):

* TLSv1.3 (IN), TLS Unknown, Certificate Status (22):

* TLSv1.3 (IN), TLS handshake, CERT verify (15):

* TLSv1.3 (IN), TLS Unknown, Certificate Status (22):

* TLSv1.3 (IN), TLS handshake, Finished (20):

* TLSv1.3 (OUT), TLS Unknown, Certificate Status (22):

* TLSv1.3 (OUT), TLS handshake, Finished (20):

* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384

* ALPN, server did not agree to a protocol

* TLSv1.3 (OUT), TLS Unknown, Unknown (23):

* TLSv1.3 (OUT), TLS Unknown, Unknown (23):

* TLSv1.3 (IN), TLS Unknown, Certificate Status (22):

* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):

* TLSv1.3 (IN), TLS Unknown, Unknown (21):

* TLSv1.3 (IN), TLS alert, Client hello (1):

* Empty reply from server

curl: (52) Empty reply from server