Raise ArgumentError if host component is nil

From: oss92 <mohamed.o.alnagdy@gmail.com>
fix https://github.com/ruby/ruby/pull/1278

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/net/http/generic_request.rb

@@ -14,6 +14,8 @@ class Net::HTTPGenericRequest
     @response_has_body = resbody
 
     if URI === uri_or_path then
+      raise ArgumentError, "not an HTTP URI" unless URI::HTTP === uri_or_path
+      raise ArgumentError, "no host component for URI" unless uri_or_path.hostname
       @uri = uri_or_path.dup
       host = @uri.hostname.dup
       host << ":".freeze << @uri.port.to_s if @uri.port != @uri.default_port

test/net/http/test_http_request.rb

@@ -65,6 +65,18 @@ class HTTPRequestTest < Test::Unit::TestCase
                          'Bug #7381 - do not decode content if the user overrides'
   end if Net::HTTP::HAVE_ZLIB
 
+  def test_initialize_GET_uri
+    req = Net::HTTP::Get.new(URI("http://example.com/foo"))
+    assert_equal "/foo", req.path
+    assert_equal "example.com", req['Host']
+
+    req = Net::HTTP::Get.new(URI("https://example.com/foo"))
+    assert_equal "/foo", req.path
+    assert_equal "example.com", req['Host']
+
+    assert_raise(ArgumentError){ Net::HTTP::Get.new(URI("urn:ietf:rfc:7231")) }
+  end
+
   def test_header_set
     req = Net::HTTP::Get.new '/'