Magento API Error: aborted: error parsing headers: duplicate header 'Content-Type' -

i upgraded server php 5.3 , fast cgi. unfortunately caused magento api return strange error

aborted: error parsing headers: duplicate header 'content-type'

i've tried various suggestions magento fourms no avail.

i'm running 1.4.0.1. suggestions how reconcile problem?

from http://www.magentocommerce.com/boards/v/viewthread/229253/

edit

app/code/core/mage/core/controller/response/http.php 

and replace sendheaders() function following code (you're not supposed override core classes, working. using app/code/local/mage/... doesn't work because controller)

/**  * transport object observers perform  *  * @var varien_object  */ protected static $_transportobject = null;  public function sendheaders() {     if (!$this->cansendheaders()) {         mage::log('headers sent: '.magedebugbacktrace(true, true, true));         return $this;     }      if (in_array(substr(php_sapi_name(), 0, 3), array('cgi', 'fpm'))) {         // remove duplicate headers         $remove = array('status', 'content-type');          // sent headers         $sent = array();         foreach (headers_list() $header) {             // parse name             if (!$pos = strpos($header, ':')) {                 continue;             }             $sent[strtolower(substr($header, 0, $pos))] = true;         }          // raw headers         $headersraw = array();         foreach ($this->_headersraw $i=>$header) {             // parse name             if (!$pos = strpos($header, ':'))                     continue;             $name = strtolower(substr($header, 0, $pos));              if (in_array($name, $remove)) {                 // check sent headers                 if (isset($sent[$name]) && $sent[$name]) {                     unset($this->_headersraw[$i]);                     continue;                 }                  // check header                 if (isset($headers[$name]) && !is_null($existing = $headers[$name])) {                     $this->_headersraw[$existing] = $header;                     unset($this->_headersraw[$i]);                 } else {                     $headersraw[$name] = $i;                 }             }         }          // object headers         $headers = array();         foreach ($this->_headers $i=>$header) {             $name = strtolower($header['name']);             if (in_array($name, $remove)) {                 // check sent headers                 if (isset($sent[$name]) && $sent[$name]) {                     unset($this->_headers[$i]);                     continue;                 }                  // check header                 if (isset($headers[$name]) && !is_null($existing = $headers[$name])) {                     $this->_headers[$existing] = $header;                     unset($this->_headers[$i]);                 } else {                     $headers[$name] = $i;                 }                  // check raw headers                 if (isset($headersraw[$name]) && !is_null($existing = $headersraw[$name])) {                     unset($this->_headersraw[$existing]);                 }             }         }     }      parent::sendheaders(); }