Index: Zend/Http/Client.php
===================================================================
--- Zend/Http/Client.php	(revision 6552)
+++ Zend/Http/Client.php	(working copy)
@@ -308,17 +308,18 @@
      * @param string|array $name Header name, full header string ('Header: value')
      *     or an array of headers
      * @param mixed $value Header value or null
+     * @param bool  $strict Validate the header name or not
      * @return Zend_Http_Client
      */
-    public function setHeaders($name, $value = null)
+    public function setHeaders($name, $value = null, $strict = true)
     {
         // If we got an array, go recusive!
         if (is_array($name)) {
             foreach ($name as $k => $v) {
                 if (is_string($k)) {
-                    $this->setHeaders($k, $v);
+                    $this->setHeaders($k, $v, $strict);
                 } else {
-                    $this->setHeaders($v, null);
+                    $this->setHeaders($v, null, $strict);
                 }
             }
         } else {
@@ -327,7 +328,7 @@
                 list($name, $value) = explode(':', $name, 2);
 
             // Make sure the name is valid
-            if (! preg_match('/^[a-zA-Z0-9-]+$/', $name)) {
+            if ($strict && ! preg_match('/^[a-zA-Z0-9-]+$/', $name)) {
                 throw new Zend_Http_Client_Exception("{$name} is not a valid HTTP header name");
             }