Как отдать MIME-тип в XML формате?

Question

[Енот Полоскун]

писал шлюз для обработки qiwi-кошелька, была непонятная ошибка. обратилась в тех.поддержку qiwi, на что мне ответили

Передаётся неверный MIME-тип: ожидаем "text/xml", получаем "text/html":

[2015.12.23 12:04:51,514] [INFO] [RMI TCP Connection(829253)-10.12.42.121] [s1548] app_version=1.105.0; counter=005238350000000044; message=
---- XML request: ----

POST /qiwi HTTP/1.1
Content-type: application/x-www-form-urlencoded
User-Agent: QWClient 1.0 (Java)
Accept: text/xml
Authorization:Basic Mj***VhhNDlO

command=bill&bill_id=_TEST_1&status=paid&error=0&amount=100.00&user=tel%3A%2B0&prv_name=235319&ccy=RUB&comment=%D1%8B%D1%84%D0%B2

---- XML response: ----

HTTP/1.1 200 OK
Vary: Accept-Encoding
Date: Wed, 23 Dec 2015 09:04:51 GMT
Content-Length: 169
Connection: keep-alive
Content-Type: text/html
Server: nginx


Parse error: syntax error, unexpected T_EXIT in /home/users/f/fastcomputers/domain

---- Events: ----
2015.12.23 12:04:51:490: Starting test notification for merchantProviderId=235319, bill=ru.qiwi.bills.model.BillInfo@59437a1c
2015.12.23 12:04:51:492: Notification process for bill 0 (prv_id = 235319, trm_txn_id = _TEST_1) started
2015.12.23 12:04:51:493: Connection establishing
2015.12.23 12:04:51:494: Sending notification data
2015.12.23 12:04:51:497: Notification data has been sent. Reading ...
2015.12.23 12:04:51:510: Wrong content type : 'text/html'
2015.12.23 12:04:51:510: During doNotify
Wrong response Content-type; expected 'text/xml'; actual 'text/html'

подскажите, чО сделать то?!