Curl request to haproxy node returning resulting in SSL_ERROR_ZERO_RETURN

I am trying to send a large multipart file to my server through haproxy. However, the request fails with SD-- in the log and the curl verbose output produces the following (command is being run on the haproxy node):

# curl --location 'https://localhost/myserver/api/fileUpload' --form 'file=@"myFile.zip"' --form "manifest=@manifest.json;type=application/json" -kv> POST /myserver/api/fileUpload HTTP/1.1> Host: localhost> User-Agent: curl/7.61.1> Accept: */*> Content-Length: 1131051568> Content-Type: multipart/form-data; boundary=------------------------7a8f18fbe3daeabf> Expect: 100-continue> < HTTP/1.1 100 Continue* TLSv1.2 (IN), TLS alert, close notify (256):* OpenSSL SSL_write: SSL_ERROR_ZERO_RETURN, errno 32* Closing connection 0

The issue does not appear with smaller files which leads me to believe that it's related to the 100 Continue thing.