diff --git a/src/Purl.php b/src/Purl.php
index 41189f0..8e80b5c 100644
--- a/src/Purl.php
+++ b/src/Purl.php
@@ -207,13 +207,13 @@ public function execute()
         }
                 
         if ($this->_headers) {
-            foreach ($this->_headers as $name => $value) {
-                $headers .= $name . ': ' . $value . "\r\n";
+            foreach ($this->_headers as $value) {
+                $headers .= $value . "\r\n";
             }
         }
-        
-        if (!isset($this->_headers['Content-type'])) $headers .= "Content-type: " . "application/x-www-form-urlencoded"."\r\n";
-        
+
+        if (!preg_match('/Content-type/', $headers)) $headers .= "Content-type: " . "application/x-www-form-urlencoded"."\r\n";
+
         return $this->_call($query, $this->_info['request_header'] = $headers);
     }
     
@@ -319,4 +319,4 @@ private function _errorHandler()
             $this->_errorno = 100;                         
         }
     }
-}
\ No newline at end of file
+}