--- tests/Zend/Controller/Request/HttpTest.php	(revision 23226)
+++ tests/Zend/Controller/Request/HttpTest.php	(working copy)
@@ -839,6 +839,16 @@
         $pathInfo = $request->getPathInfo();
         $this->assertEquals('/index/index', $pathInfo);
     }
+
+    /**
+     * @group ZF-10577
+     */
+    public function testGetHeaderWithEmptyValueReturnsEmptyString()
+    {
+        $_SERVER['HTTP_X_FOO'] = '';
+        
+        $this->assertSame('', $this->_request->getHeader('X-Foo'));
+    }
 }
 
 // Call Zend_Controller_Request_HttpTest::main() if this source file is executed directly.
Index: tests/Zend/Paginator/_files/test.sqlite
===================================================================
Cannot display: file marked as a binary type.
svn:mime-type = application/octet-stream
Index: library/Zend/Controller/Request/Http.php
===================================================================
--- library/Zend/Controller/Request/Http.php	(revision 23226)
+++ library/Zend/Controller/Request/Http.php	(working copy)
@@ -979,7 +979,7 @@
 
         // Try to get it from the $_SERVER array first
         $temp = 'HTTP_' . strtoupper(str_replace('-', '_', $header));
-        if (!empty($_SERVER[$temp])) {
+        if (isset($_SERVER[$temp])) {
             return $_SERVER[$temp];
         }
 
@@ -987,7 +987,7 @@
         // Apache
         if (function_exists('apache_request_headers')) {
             $headers = apache_request_headers();
-            if (!empty($headers[$header])) {
+            if (isset($headers[$header])) {
                 return $headers[$header];
             }
             $header = strtolower($header);