diff --git a/ChangeLog b/ChangeLog
index 9d66274f22..3e165101dc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Wed Dec 24 02:44:06 2014  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* lib/net/http/response.rb (Net::HTTPResponse): require one or more
+	  spaces [Bug #10591].
+	  by leriksen <leif.eriksen.au@gmail.com>
+	  https://github.com/ruby/ruby/pull/782 fix GH-782
+	  NOTE: graph.facebook.com returns without SP Reason-Phrase.
+
 Wed Dec 24 02:12:22 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* tool/make-snapshot (package): VCS#branch_list expects glob a
diff --git a/lib/net/http/response.rb b/lib/net/http/response.rb
index 777aca9e45..b0731694ca 100644
--- a/lib/net/http/response.rb
+++ b/lib/net/http/response.rb
@@ -37,7 +37,7 @@ class Net::HTTPResponse
 
     def read_status_line(sock)
       str = sock.readline
-      m = /\AHTTP(?:\/(\d+\.\d+))?\s+(\d\d\d)\s*(.*)\z/in.match(str) or
+      m = /\AHTTP(?:\/(\d+\.\d+))?\s+(\d\d\d)(?:\s+(.*))?\z/in.match(str) or
         raise Net::HTTPBadResponse, "wrong status line: #{str.dump}"
       m.captures
     end
diff --git a/test/net/http/test_httpresponse.rb b/test/net/http/test_httpresponse.rb
index 974f8296cc..0193a153e4 100644
--- a/test/net/http/test_httpresponse.rb
+++ b/test/net/http/test_httpresponse.rb
@@ -244,6 +244,65 @@ EOS
     refute_same  uri, response.uri
   end
 
+  def test_ensure_zero_space_does_not_regress
+    io = dummy_io(<<EOS)
+HTTP/1.1 200OK
+Content-Length: 5
+Connection: close
+
+hello
+EOS
+
+    assert_raises Net::HTTPBadResponse do
+      Net::HTTPResponse.read_new(io)
+    end
+  end
+
+  def test_allow_trailing_space_after_status
+    io = dummy_io(<<EOS)
+HTTP/1.1 200\s
+Content-Length: 5
+Connection: close
+
+hello
+EOS
+
+    res = Net::HTTPResponse.read_new(io)
+    assert_equal('1.1', res.http_version)
+    assert_equal('200', res.code)
+    assert_equal('', res.message)
+  end
+
+  def test_normal_status_line
+    io = dummy_io(<<EOS)
+HTTP/1.1 200 OK
+Content-Length: 5
+Connection: close
+
+hello
+EOS
+
+    res = Net::HTTPResponse.read_new(io)
+    assert_equal('1.1', res.http_version)
+    assert_equal('200', res.code)
+    assert_equal('OK', res.message)
+  end
+
+  def test_allow_empty_reason_code
+    io = dummy_io(<<EOS)
+HTTP/1.1 200
+Content-Length: 5
+Connection: close
+
+hello
+EOS
+
+    res = Net::HTTPResponse.read_new(io)
+    assert_equal('1.1', res.http_version)
+    assert_equal('200', res.code)
+    assert_equal(nil, res.message)
+  end
+
 private
 
   def dummy_io(str)