diff --git a/config/core_ext/net-http-multipart.rb b/config/core_ext/net-http-multipart.rb
deleted file mode 100644
index a98a113b..00000000
--- a/config/core_ext/net-http-multipart.rb
+++ /dev/null
@@ -1,26 +0,0 @@
-require "net/http"
-
-class Net::HTTP::Post
-  def multipart=(params = [])
-    boundary_token = "--multipart-boundary"
-    self.content_type = "multipart/form-data; boundary=#{boundary_token}"
-
-    self.body = ""
-    params.each do |p|
-      self.body += "--#{boundary_token}\r\n"
-      self.body += "Content-Disposition: form-data; name=#{p[:name]}"
-      self.body += "; filename=#{p[:filename]}" if p[:filename]
-      self.body += "\r\n"
-      if p[:binary]
-        self.body += "Content-Transfer-Encoding: binary\r\n"
-
-        mime_type = MiniMime.lookup_by_filename(p[:filename].to_s).try(:content_type)
-        mime_type ||= "application/octet-stream"
-
-        self.body += "Content-Type: #{mime_type}\r\n"
-      end
-      self.body += "\r\n#{p[:data]}\r\n"
-    end
-    self.body += "--#{boundary_token}--\r\n"
-  end
-end
diff --git a/lib/similar_images.rb b/lib/similar_images.rb
index f337437d..29dd3a53 100644
--- a/lib/similar_images.rb
+++ b/lib/similar_images.rb
@@ -52,23 +52,15 @@ module SimilarImages
 
         params = []
         if search_url
-          params += [ {
-            name: "url",
-            data: search_url
-          } ]
+          params << [ "url", search_url ]
         else
-          params += [ {
-            name: "file",
-            binary: true,
-            data: source_file,
-            filename: File.basename(source_filename)
-          } ]
+          params << [ "file", source_file, filename: File.basename(source_filename) ]
         end
 
         services_list.each do |s|
-          params += [ { name: "service[]", data: s } ]
+          params << [ "service[]", s ]
         end
-        params += [ { name: "forcegray", data: "on" } ] if options[:forcegray] == "1"
+        params << [ "forcegray", "on" ] if options[:forcegray] == "1"
 
         begin
           Timeout.timeout(10) do
@@ -85,7 +77,7 @@ module SimilarImages
               http.read_timeout = 10
 
               request = Net::HTTP::Post.new(server)
-              request.multipart = params
+              request.set_form params, "multipart/form-data"
               response = http.request(request)
               server_responses[server] = response.body
             end