diff --git a/src/mechanize/form.cr b/src/mechanize/form.cr
index 6a2226f..be3334f 100644
--- a/src/mechanize/form.cr
+++ b/src/mechanize/form.cr
@@ -82,6 +82,7 @@ class MechanizeCr::Form
     end
     successful_controls.each do |ctrl|
       value = ctrl.query_value
+      next if value[0] == ""
       query.push(value)
     end
     query
diff --git a/src/mechanize/http/agent.cr b/src/mechanize/http/agent.cr
index 03f1dd6..40d0104 100644
--- a/src/mechanize/http/agent.cr
+++ b/src/mechanize/http/agent.cr
@@ -93,6 +93,7 @@ module MechanizeCr
           referer_uri = current_page.uri
           host = referer_uri.host
           scheme = referer_uri.scheme
+          uri = "/" + uri unless uri[0] == '/'
           new_uri = URI.new(scheme: scheme, host: host, path: uri)
         end
       end