Send X-UA-Compatible as HTTP header instead of meta tag

index.php

@@ -44,6 +44,7 @@ $RCMAIL = rcmail::get_instance($GLOBALS['env']);
 
 // Make the whole PHP output non-cacheable (#1487797)
 $RCMAIL->output->nocacheing_headers();
+$RCMAIL->output->common_headers();
 
 // turn on output buffering
 ob_start();

program/lib/Roundcube/rcube_output.php

@@ -44,7 +44,6 @@ abstract class rcube_output
         $this->browser = new rcube_browser();
     }
 
-
     /**
      * Magic getter
      */
@@ -60,7 +59,6 @@ abstract class rcube_output
         return null;
     }
 
-
     /**
      * Setter for output charset.
      * To be specified in a meta tag and sent as http-header
@@ -72,7 +70,6 @@ abstract class rcube_output
         $this->charset = $charset;
     }
 
-
     /**
      * Getter for output charset
      *
@@ -83,7 +80,6 @@ abstract class rcube_output
         return $this->charset;
     }
 
-
     /**
      * Set environment variable
      *
@@ -95,7 +91,6 @@ abstract class rcube_output
         $this->env[$name] = $value;
     }
 
-
     /**
      * Environment variable getter.
      *
@@ -108,7 +103,6 @@ abstract class rcube_output
         return $this->env[$name];
     }
 
-
     /**
      * Delete all stored env variables and commands
      */
@@ -117,7 +111,6 @@ abstract class rcube_output
         $this->env = array();
     }
 
-
     /**
      * Invoke display_message command
      *
@@ -129,7 +122,6 @@ abstract class rcube_output
      */
     abstract function show_message($message, $type = 'notice', $vars = null, $override = true, $timeout = 0);
 
-
     /**
      * Redirect to a certain url.
      *
@@ -138,13 +130,11 @@ abstract class rcube_output
      */
     abstract function redirect($p = array(), $delay = 1);
 
-
     /**
      * Send output to the client.
      */
     abstract function send();
 
-
     /**
      * Send HTTP headers to prevent caching a page
      */
@@ -157,9 +147,6 @@ abstract class rcube_output
         header("Expires: ".gmdate("D, d M Y H:i:s")." GMT");
         header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
 
-        // Request browser to disable DNS prefetching (CVE-2010-0464)
-        header("X-DNS-Prefetch-Control: off");
-
         // We need to set the following headers to make downloads work using IE in HTTPS mode.
         if ($this->browser->ie && rcube_utils::https_check()) {
             header('Pragma: private');
@@ -178,14 +165,32 @@ abstract class rcube_output
      */
     public function future_expire_header($offset = 2600000)
     {
-        if (headers_sent())
+        if (headers_sent()) {
             return;
+        }
 
         header("Expires: " . gmdate("D, d M Y H:i:s", time()+$offset) . " GMT");
         header("Cache-Control: max-age=$offset");
         header("Pragma: ");
     }
 
+    /**
+     * Send browser compatibility/security/etc. headers
+     */
+    public function common_headers()
+    {
+        if (headers_sent()) {
+            return;
+        }
+
+        // Unlock IE compatibility mode
+        if ($this->browser->ie) {
+            header('X-UA-Compatible: IE=edge');
+        }
+
+        // Request browser to disable DNS prefetching (CVE-2010-0464)
+        header("X-DNS-Prefetch-Control: off");
+    }
 
     /**
      * Show error page and terminate script execution
@@ -200,7 +205,6 @@ abstract class rcube_output
         exit(-1);
     }
 
-
     /**
      * Create an edit field for inclusion on a form
      *
@@ -253,7 +257,6 @@ abstract class rcube_output
         return $out;
     }
 
-
     /**
      * Convert a variable into a javascript object notation
      *
@@ -269,5 +272,4 @@ abstract class rcube_output
         // that's why we have @ here
         return @json_encode($input);
     }
-
 }

skins/classic/includes/links.html

@@ -1,4 +1,3 @@
-<meta http-equiv="X-UA-Compatible" content="IE=EDGE" />
 <link rel="index" href="$__comm_path" />
 <link rel="shortcut icon" href="/images/favicon.ico"/>
 <link rel="stylesheet" type="text/css" href="/common.css" />

skins/larry/includes/links.html

@@ -1,4 +1,3 @@
-<meta http-equiv="X-UA-Compatible" content="IE=EDGE" />
 <meta name="viewport" content="" id="viewport" />
 <link rel="shortcut icon" href="/images/favicon.ico"/>
 <link rel="stylesheet" type="text/css" href="/styles.css" />