diff --git a/lib/uri/generic.rb b/lib/uri/generic.rb
index 6fd0f7c..3071c45 100644
--- a/lib/uri/generic.rb
+++ b/lib/uri/generic.rb
@@ -576,7 +576,7 @@ def password
 
     # Returns the authority info (array of user, password, host and
     # port), if any is set.  Or returns +nil+.
-    def authority
+    def authority_components
       return @user, @password, @host, @port if @user || @password || @host || @port
     end
 
@@ -624,7 +624,7 @@ def set_host(v)
     # Protected setter for the authority info (+user+, +password+, +host+
     # and +port+).  If +port+ is +nil+, +default_port+ will be set.
     #
-    protected def set_authority(user, password, host, port = nil)
+    protected def set_authority_components(user, password, host, port = nil)
       @user, @password, @host, @port = user, password, host, port || self.default_port
     end
 
@@ -747,6 +747,45 @@ def port=(v)
       port
     end
 
+    #
+    # == Description
+    #
+    # Returns the authority of the URI, as defined in
+    # https://www.rfc-editor.org/rfc/rfc3986#section-3.2.
+    #
+    #   authority = [ userinfo "@" ] host [ ":" port ]
+    #
+    # Returns an empty string if no authority is present.
+    #
+    # == Usage
+    #
+    #   require 'uri'
+    #
+    #   URI::HTTP.build(host: 'www.example.com', path: '/foo/bar').authority
+    #   #=> "www.example.com"
+    #   URI::HTTP.build(host: 'www.example.com', port: 8000, path: '/foo/bar').authority
+    #   #=> "www.example.com:8000"
+    #   URI::HTTP.build(host: 'www.example.com', port: 80, path: '/foo/bar').authority
+    #   #=> "www.example.com"
+    #   URI::HTTP.build(host: 'www.example.com', userinfo: 'user:password').authority
+    #   #=> "user:password@www.example.com"
+    #
+    def authority
+      str = ''.dup
+      if self.userinfo
+        str << self.userinfo
+        str << '@'
+      end
+      if @host
+        str << @host
+      end
+      if @port && @port != self.default_port
+        str << ':'
+        str << @port.to_s
+      end
+      str
+    end
+
     def check_registry(v) # :nodoc:
       raise InvalidURIError, "cannot set registry"
     end
@@ -1136,7 +1175,7 @@ def merge(oth)
 
       base = self.dup
 
-      authority = rel.authority
+      authority = rel.authority_components
 
       # RFC2396, Section 5.2, 2)
       if (rel.path.nil? || rel.path.empty?) && !authority && !rel.query
@@ -1149,7 +1188,7 @@ def merge(oth)
 
       # RFC2396, Section 5.2, 4)
       if authority
-        base.set_authority(*authority)
+        base.set_authority_components(*authority)
         base.set_path(rel.path)
       elsif base.path && rel.path
         base.set_path(merge_path(base.path, rel.path))
@@ -1365,17 +1404,7 @@ def to_s
         if @host || %w[file postgres].include?(@scheme)
           str << '//'
         end
-        if self.userinfo
-          str << self.userinfo
-          str << '@'
-        end
-        if @host
-          str << @host
-        end
-        if @port && @port != self.default_port
-          str << ':'
-          str << @port.to_s
-        end
+        str << self.authority
         if (@host || @port) && !@path.empty? && !@path.start_with?('/')
           str << '/'
         end
diff --git a/lib/uri/http.rb b/lib/uri/http.rb
index 3c41cd4..076c689 100644
--- a/lib/uri/http.rb
+++ b/lib/uri/http.rb
@@ -93,27 +93,6 @@ def request_uri
       url.start_with?(?/.freeze) ? url : ?/ + url
     end
 
-    #
-    # == Description
-    #
-    # Returns the authority for an HTTP uri, as defined in
-    # https://www.rfc-editor.org/rfc/rfc3986#section-3.2.
-    #
-    #
-    # Example:
-    #
-    #     URI::HTTP.build(host: 'www.example.com', path: '/foo/bar').authority #=> "www.example.com"
-    #     URI::HTTP.build(host: 'www.example.com', port: 8000, path: '/foo/bar').authority #=> "www.example.com:8000"
-    #     URI::HTTP.build(host: 'www.example.com', port: 80, path: '/foo/bar').authority #=> "www.example.com"
-    #
-    def authority
-      if port == default_port
-        host
-      else
-        "#{host}:#{port}"
-      end
-    end
-
     #
     # == Description
     #
@@ -127,9 +106,14 @@ def authority
     #     URI::HTTP.build(host: 'www.example.com', port: 8000, path: '/foo/bar').origin #=> "http://www.example.com:8000"
     #     URI::HTTP.build(host: 'www.example.com', port: 80, path: '/foo/bar').origin #=> "http://www.example.com"
     #     URI::HTTPS.build(host: 'www.example.com', path: '/foo/bar').origin #=> "https://www.example.com"
+    #     URI::HTTPS.build(host: 'www.example.com', userinfo: 'user:password').origin #=> "https://www.example.com"
     #
     def origin
-      "#{scheme}://#{authority}"
+      str = "#{scheme}://#{host}"
+      if port != default_port
+        str << ":#{port}"
+      end
+      str
     end
   end
 
diff --git a/test/uri/test_http.rb b/test/uri/test_http.rb
index 8816d20..78912fd 100644
--- a/test/uri/test_http.rb
+++ b/test/uri/test_http.rb
@@ -73,13 +73,14 @@ def test_authority
     assert_equal('a.b.c', URI.parse('http://a.b.c/').authority)
     assert_equal('a.b.c:8081', URI.parse('http://a.b.c:8081/').authority)
     assert_equal('a.b.c', URI.parse('http://a.b.c:80/').authority)
+    assert_equal('userinfo@a.b.c', URI.parse('https://userinfo@a.b.c/').authority)
   end
 
-
   def test_origin
     assert_equal('http://a.b.c', URI.parse('http://a.b.c/').origin)
     assert_equal('http://a.b.c:8081', URI.parse('http://a.b.c:8081/').origin)
     assert_equal('http://a.b.c', URI.parse('http://a.b.c:80/').origin)
     assert_equal('https://a.b.c', URI.parse('https://a.b.c/').origin)
+    assert_equal('https://a.b.c', URI.parse('https://userinfo@a.b.c/').origin)
   end
 end