Fix JSON responses from micropub endpoint

config.ru

@@ -25,7 +25,7 @@ end
 
 require "adamantium/middleware/header_fix"
 use Adamantium::Middleware::HeaderFix do |headers, env|
-  unless headers["Content-Type"]&.include? "xml"
+  unless headers["Content-Type"]&.downcase&.include?("xml") || headers["Content-Type"]&.downcase&.include?("json")
     headers["Content-Type"] = "text/html; charset=utf-8"
   end
 end

slices/micropub/actions/site/config.rb

@@ -8,7 +8,7 @@ module Micropub
         def handle(req, res)
           if req.params[:q] == "config"
             res.status = 200
-            res.content_type = "application/json"
+            res.content_type = "Application/JSON"
             res.body = {
               "media-endpoint" => settings.micropub_media_endpoint,
               "destination" => [