HTTP Response header - XML Gateway

Hello,

We have implemented E-invoicing outbound functionality for AR transactions. The payload is being generated correctly in ecx_doclogs and the connection is working fine too. The only issue is OTA is sending additional html response as folllowing:

HTTP Header
Http-Version: HTTP/1.1
Authorization: Digest username="myusername",
realm="testrealm@host.com",
 nonce="dcd98b7102dd2f0e8b11d0f600bfb0c093",
 uri="/dir/index.html",
qop=auth,
nc=00000001,
cnonce="0a4f113b",
response="6629fae49393a05397450978507c4ef1",
opaque="5ccc069c403ebaf9f0171e9517f40e41"
 Content-length: 12345
Content-type: text/html
HTTP Body
TRANSPORT_PROTOCOL=OXTA
 TRANSPORT_PROTOCOL_VERSION=1.0
REQUEST_TYPE=SEND
MESSAGE_ID=A1234567890ZZ0987654321
MESSAGE_TYPE=XML
MESSAGE_STANDARD=OAG
 TRANSACTION_TYPE=PO
TRANSACTION_SUBTYPE=PROCESS
 DOCUMENT_NUMBER=12345
 PARTYID=9999
PARTY_SITE_ID=8888
 PROTOCOL_TYPE=HTTPS-OXTA
 PROTOCOL_ADDRESS=HTTPS://www.me.com/servlets/oracle.ecx.oxta. transportAgentServer
USERNAME=myusername
PASSWORD=myloginpassword