POST /receive HTTP/1.1
   Host: 10.234.160.12:80
   User-Agent: AS2 Company Server
   Date: Wed, 31 Jul 2025 13:34:50 GMT
   AS2-Version: 1.3
   AS2-From: "as2 Name"
   AS2-To: 0123456780000
   Subject: Test Case
   Message-Id: <200207310834482A70BF63@\"~~foo~~\">
   Disposition-Notification-To: mrAS2@example.com
   Disposition-Notification-Options: signed-receipt-protocol=optional,
        pkcs7-signature; signed-receipt-micalg=optional,sha-256
   Content-Type: multipart/signed; boundary="as2BouNdary1as2";
        protocol="application/pkcs7-signature"; micalg=sha-256
   Content-Length: 2464

   --as2BouNdary1as2
   Content-Type: application/edi-x12
   Content-Disposition: attachment; filename=rfc1767.dat

     {ISA ...EDI transaction data...IEA...}

   --as2BouNdary1as2
   Content-Type: application/pkcs7-signature

     {omitted binary pkcs7 signature data}

   --as2BouNdary1as2--