Fix HEAD response header for brid.gy

Gemfile

@@ -31,6 +31,7 @@ gem "matrix"
 
 gem "rack-session"
 gem "rack-rewrite"
+gem "rack-contrib"
 
 gem "ruby-readability", require: "readability"
 gem "down"

Gemfile.lock

@@ -331,6 +331,8 @@ GEM
     que (2.3.0)
     racc (1.7.3)
     rack (2.2.8)
+    rack-contrib (2.4.0)
+      rack (< 4)
     rack-rewrite (1.5.1)
     rack-session (1.0.1)
       rack (< 3)
@@ -524,6 +526,7 @@ DEPENDENCIES
   pg
   puma
   que
+  rack-contrib
   rack-rewrite
   rack-session
   rack-test

app/action.rb

@@ -22,6 +22,10 @@ module Adamantium
     handle_exception ROM::TupleCountMismatchError => :not_found
     handle_exception StandardError => :handle_error
 
+    config.default_headers = {
+      "Content-Type" => "text/html"
+    }
+
     def cache(key:, content:)
       cacher.call(key: key, content: content, expiry: TimeMath.min.advance(Time.now, +10))
     end

config.ru

@@ -15,7 +15,14 @@ use Rack::Session::Cookie,
 require "rack/rewrite"
 use Rack::Rewrite do
   # remove trailing slashes
-  # r302 %r{(/.*)/(\?.*)?$}, "$1$2"
+  r302 %r{(/.*)/(\?.*)?$}, "$1$2"
+end
+
+require "adamantium/middleware/header_fix"
+use Adamantium::Middleware::HeaderFix do |headers, env|
+  if env["REQUEST_METHOD"] == "HEAD"
+    headers['Content-Type'] = "text/html"
+  end
 end
 
 run Hanami.app

config/routes.rb

@@ -8,7 +8,7 @@ module Adamantium
 
     slice :micropub, at: "/micropub"
 
-    get "/", to: "site.home"
+    root to: "site.home"
     get "/post/top_tracks/:slug", to: "posts.top_tracks"
     get "/post/:slug", to: "posts.show"
     get "/posts", to: "posts.index"

lib/adamantium/middleware/header_fix.rb

@@ -0,0 +1,24 @@
+require "rack"
+require "rack/contrib"
+
+module Adamantium
+  module Middleware
+    class HeaderFix
+      HEADERS_KLASS = Rack.release < "3" ? Rack::Utils::HeaderHash : Rack::Headers
+      private_constant :HEADERS_KLASS
+
+      def initialize(app, &block)
+        @app = app
+        @block = block
+      end
+
+      def call(env)
+        response = @app.call(env)
+        headers = HEADERS_KLASS.new.merge(response[1])
+        @block.call(headers, env)
+        response[1] = headers
+        response
+      end
+    end
+  end
+end