v2.3.13: proper case handling of Host header

index.js

@@ -502,7 +502,7 @@ Greenlock.create = function (gl) {
       if (!host[0]) { realNext(); return; }
 
       // if so, remove non-allowed characters
-      var safehost = host[0].replace(SERVERNAME_G, '');
+      var safehost = host[0].toLowerCase().replace(SERVERNAME_G, '');
 
       // if there were unallowed characters, complain
       if (!gl.__sni_allow_dangerous_names && safehost.length !== host[0].length) {
@@ -513,7 +513,7 @@ Greenlock.create = function (gl) {
 
       // make lowercase
       if (!gl.__sni_preserve_case) {
-        host[0] = host[0].toLowerCase();
+        host[0] = safehost;
         req.headers.host = host.join(':');
       }
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "greenlock",
-  "version": "2.3.12",
+  "version": "2.3.13",
   "description": "Let's Encrypt for node.js on npm",
   "main": "index.js",
   "files": [