From 2c3e5f81c648448824a1a79e9b72e3532d8caa4a Mon Sep 17 00:00:00 2001
From: vzaidman <vzaidman@gmail.com>
Date: Wed, 9 Aug 2017 17:21:04 +0300
Subject: [PATCH] added _ to the list of valid hostnames

---
 src/URI.js   | 6 +++---
 test/test.js | 5 +++++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/URI.js b/src/URI.js
index 03f2c6c1..2420fb24 100644
--- a/src/URI.js
+++ b/src/URI.js
@@ -249,7 +249,7 @@
   // allowed hostname characters according to RFC 3986
   // ALPHA DIGIT "-" "." "_" "~" "!" "$" "&" "'" "(" ")" "*" "+" "," ";" "=" %encoded
   // I've never seen a (non-IDN) hostname other than: ALPHA DIGIT . -
-  URI.invalid_hostname_characters = /[^a-zA-Z0-9\.\-:]/;
+  URI.invalid_hostname_characters = /[^a-zA-Z0-9\.\-:_]/;
   // map DOM Elements to their URI attribute
   URI.domAttributes = {
     'a': 'href',
@@ -1044,10 +1044,10 @@
     } else if (v && v.match(URI.invalid_hostname_characters)) {
       // test punycode
       if (!punycode) {
-        throw new TypeError('Hostname "' + v + '" contains characters other than [A-Z0-9.-] and Punycode.js is not available');
+        throw new TypeError('Hostname "' + v + '" contains characters other than [A-Z0-9.-_] and Punycode.js is not available');
       }
       if (punycode.toASCII(v).match(URI.invalid_hostname_characters)) {
-        throw new TypeError('Hostname "' + v + '" contains characters other than [A-Z0-9.:-]');
+        throw new TypeError('Hostname "' + v + '" contains characters other than [A-Z0-9.-_]');
       }
     }
   };
diff --git a/test/test.js b/test/test.js
index 8ebf8623..9a2be98f 100644
--- a/test/test.js
+++ b/test/test.js
@@ -124,6 +124,11 @@
     ok(u instanceof URI, 'instanceof URI');
     ok(u._parts.hostname !== undefined, 'host undefined');
   });
+  test('function URI(string) with complex hostname', function() {
+    var u = new URI('http://some.complex_host-name123.org/');
+    ok(u instanceof URI, 'instanceof URI');
+    ok(u._parts.hostname !== undefined, 'host undefined');
+  });
   test('function URI(string) with invalid port "port" throws', function () {
     raises(function () {
       new URI('http://example.org:port');