diff --git a/src/invidious/jsonify/api_v1/common.cr b/src/invidious/jsonify/api_v1/common.cr
index 64b06465..e5095abb 100644
--- a/src/invidious/jsonify/api_v1/common.cr
+++ b/src/invidious/jsonify/api_v1/common.cr
@@ -8,7 +8,7 @@ module Invidious::JSONify::APIv1
       build_thumbnails(id).each do |thumbnail|
         json.object do
           json.field "quality", thumbnail[:name]
-          json.field "url", "#{thumbnail[:host]}/vi/#{id}/#{thumbnail["url"]}.jpg"
+          json.field "url", "/vi/#{id}/#{thumbnail["url"]}.jpg"
           json.field "width", thumbnail[:width]
           json.field "height", thumbnail[:height]
         end
diff --git a/src/invidious/routes/api/manifest.cr b/src/invidious/routes/api/manifest.cr
index 729a40b8..4e2a1b50 100644
--- a/src/invidious/routes/api/manifest.cr
+++ b/src/invidious/routes/api/manifest.cr
@@ -224,7 +224,7 @@ module Invidious::Routes::API::Manifest
         if !proxy.empty?
           "#{proxy}/videoplayback?#{raw_params}"
         else
-          "#{HOST_URL}/videoplayback?#{raw_params}"
+          "#{env.request.headers["Host"]}/videoplayback?#{raw_params}"
         end
       end
     end
@@ -248,7 +248,7 @@ module Invidious::Routes::API::Manifest
     manifest = response.body
 
     if local
-      manifest = manifest.gsub("https://www.youtube.com", HOST_URL)
+      manifest = manifest.gsub("https://www.youtube.com", env.request.headers["Host"])
       manifest = manifest.gsub("index.m3u8", "index.m3u8?local=true")
     end
 
diff --git a/src/invidious/routes/api/v1/authenticated.cr b/src/invidious/routes/api/v1/authenticated.cr
index a35d2f2b..738a43de 100644
--- a/src/invidious/routes/api/v1/authenticated.cr
+++ b/src/invidious/routes/api/v1/authenticated.cr
@@ -226,7 +226,7 @@ module Invidious::Routes::API::V1::Authenticated
     end
 
     playlist = create_playlist(title, privacy, user)
-    env.response.headers["Location"] = "#{HOST_URL}/api/v1/auth/playlists/#{playlist.id}"
+    env.response.headers["Location"] = "#{env.request.headers["Host"]}/api/v1/auth/playlists/#{playlist.id}"
     env.response.status_code = 201
     {
       "title"      => title,
diff --git a/src/invidious/views/channel.ecr b/src/invidious/views/channel.ecr
index a84e44bc..4400b8ea 100644
--- a/src/invidious/views/channel.ecr
+++ b/src/invidious/views/channel.ecr
@@ -2,6 +2,7 @@
   ucid = channel.ucid
   author = HTML.escape(channel.author)
   channel_profile_pic = URI.parse(channel.author_thumbnail).request_target
+  host = env.request.headers["Host"]
 
   relative_url =
     case selected_tab
@@ -28,15 +29,15 @@
 <%- if selected_tab.videos? -%>
 <meta name="description" content="<%= channel.description %>">
 <meta property="og:site_name" content="Invidious">
-<meta property="og:url" content="<%= HOST_URL %>/channel/<%= ucid %>">
+<meta property="og:url" content="<%= host %>/channel/<%= ucid %>">
 <meta property="og:title" content="<%= author %>">
-<meta property="og:image" content="<%= HOST_URL %>/ggpht<%= channel_profile_pic %>">
+<meta property="og:image" content="<%= host %>/ggpht<%= channel_profile_pic %>">
 <meta property="og:description" content="<%= channel.description %>">
 <meta name="twitter:card" content="summary">
-<meta name="twitter:url" content="<%= HOST_URL %>/channel/<%= ucid %>">
+<meta name="twitter:url" content="<%= host %>/channel/<%= ucid %>">
 <meta name="twitter:title" content="<%= author %>">
 <meta name="twitter:description" content="<%= channel.description %>">
-<meta name="twitter:image" content="<%= HOST_URL %>/ggpht<%= channel_profile_pic %>">
+<meta name="twitter:image" content="<%= host %>/ggpht<%= channel_profile_pic %>">
 <link rel="alternate" type="application/rss+xml" title="RSS" href="/feed/channel/<%= ucid %>" />
 <%- end -%>
 
diff --git a/src/invidious/views/watch.ecr b/src/invidious/views/watch.ecr
index e77b0b14..9f9c171c 100644
--- a/src/invidious/views/watch.ecr
+++ b/src/invidious/views/watch.ecr
@@ -1,6 +1,7 @@
 <% ucid = video.ucid %>
 <% title = HTML.escape(video.title) %>
 <% author = HTML.escape(video.author) %>
+<% host = env.request.headers["Host"] %>
 
 
 <% content_for "header" do %>
@@ -8,9 +9,9 @@
 <meta name="description" content="<%= HTML.escape(video.short_description) %>">
 <meta name="keywords" content="<%= video.keywords.join(",") %>">
 <meta property="og:site_name" content="<%= author %> | Invidious">
-<meta property="og:url" content="<%= HOST_URL %>/watch?v=<%= video.id %>">
+<meta property="og:url" content="<%= host %>/watch?v=<%= video.id %>">
 <meta property="og:title" content="<%= title %>">
-<meta property="og:image" content="<%= HOST_URL %>/vi/<%= video.id %>/maxres.jpg">
+<meta property="og:image" content="<%= host %>/vi/<%= video.id %>/maxres.jpg">
 <meta property="og:description" content="<%= HTML.escape(video.short_description) %>">
 <meta property="og:type" content="video.other">
 <!-- This shouldn't be empty, ever. -->
@@ -21,11 +22,11 @@
 <meta property="og:video:width" content="640">
 <meta property="og:video:height" content="360">
 <meta name="twitter:card" content="player">
-<meta name="twitter:url" content="<%= HOST_URL %>/watch?v=<%= video.id %>">
+<meta name="twitter:url" content="<%= host %>/watch?v=<%= video.id %>">
 <meta name="twitter:title" content="<%= title %>">
 <meta name="twitter:description" content="<%= HTML.escape(video.short_description) %>">
-<meta name="twitter:image" content="<%= HOST_URL %>/vi/<%= video.id %>/maxres.jpg">
-<meta name="twitter:player" content="<%= HOST_URL %>/embed/<%= video.id %>">
+<meta name="twitter:image" content="<%= host %>/vi/<%= video.id %>/maxres.jpg">
+<meta name="twitter:player" content="<%= host %>/embed/<%= video.id %>">
 <meta name="twitter:player:width" content="1280">
 <meta name="twitter:player:height" content="720">
 <link rel="alternate" href="https://www.youtube.com/watch?v=<%= video.id %>">