Header
POST /cgi-bin/webscr HTTP/1.0
Content-Type: application/x-www-form-urlencoded
Content-Length: 991


 $res data sent to PayPal in the header

cmd=_notify-validate&mc_gross=49.00&protection_eligibility=Eligible&address_status=confirmed&payer_id=W3GKRC7NSGMG8&tax=0.00&address_street=1+Main+St&payment_date=12%3A39%3A33+Aug+13%2C+2012+PDT&payment_status=Completed&charset=windows-1252&address_zip=95131&first_name=buyer&mc_fee=1.72&address_country_code=US&address_name=buyer+guy&notify_version=3.5&custom=53-3&payer_status=verified&business=jesper_1339336809_biz%40hotmail.com&address_country=United+States&address_city=San+Jose&quantity=1&verify_sign=AIOg.GuXDSc1G9bWhHJZxjXKjLgbAD9LX3QD4Mx9L-P0h2kPWSD-eS38&payer_email=buy_1339336940_per%40hotmail.com&txn_id=11J64109XR080062L&payment_type=instant&last_name=guy&address_state=CA&receiver_email=jesper_1339336809_biz%40hotmail.com&payment_fee=1.72&receiver_id=BA62G8HKCSR4A&txn_type=web_accept&item_name=FusionCMS+V6&mc_currency=USD&item_number=&residence_country=US&test_ipn=1&handling_amount=0.00&transaction_subject=53-3&payment_gross=49.00&shipping=0.00&ipn_track_id=d8abd7e42f8a3


 PayPal response

HTTP/1.0 400 Bad Request
Server: BigIP
Connection: close
Content-Length: 19

Invalid Host header

 $_POST:
Array
(
    [mc_gross] => 49.00
    [protection_eligibility] => Eligible
    [address_status] => confirmed
    [payer_id] => W3GKRC7NSGMG8
    [tax] => 0.00
    [address_street] => 1 Main St
    [payment_date] => 12:39:33 Aug 13, 2012 PDT
    [payment_status] => Completed
    [charset] => windows-1252
    [address_zip] => 95131
    [first_name] => buyer
    [mc_fee] => 1.72
    [address_country_code] => US
    [address_name] => buyer guy
    [notify_version] => 3.5
    [custom] => 53-3
    [payer_status] => verified
    [business] => jesper_1339336809_biz@hotmail.com
    [address_country] => United States
    [address_city] => San Jose
    [quantity] => 1
    [verify_sign] => AIOg.GuXDSc1G9bWhHJZxjXKjLgbAD9LX3QD4Mx9L-P0h2kPWSD-eS38
    [payer_email] => buy_1339336940_per@hotmail.com
    [txn_id] => 11J64109XR080062L
    [payment_type] => instant
    [last_name] => guy
    [address_state] => CA
    [receiver_email] => jesper_1339336809_biz@hotmail.com
    [payment_fee] => 1.72
    [receiver_id] => BA62G8HKCSR4A
    [txn_type] => web_accept
    [item_name] => FusionCMS V6
    [mc_currency] => USD
    [item_number] =>
    [residence_country] => US
    [test_ipn] => 1
    [handling_amount] => 0.00
    [transaction_subject] => 53-3
    [payment_gross] => 49.00
    [shipping] => 0.00
    [ipn_track_id] => d8abd7e42f8a3
)