diff --git a/src/invidious/routes/api/manifest.cr b/src/invidious/routes/api/manifest.cr
index d89e752c..5439e604 100644
--- a/src/invidious/routes/api/manifest.cr
+++ b/src/invidious/routes/api/manifest.cr
@@ -27,28 +27,21 @@ module Invidious::Routes::API::Manifest
         haltf env, status_code: response.status_code
       end
 
-      manifest = response.body
-
-      manifest = manifest.gsub(/<BaseURL>[^<]+<\/BaseURL>/) do |baseurl|
-        url = baseurl.lchop("<BaseURL>")
-        url = url.rchop("</BaseURL>")
-
-        if local
-          uri = URI.parse(url)
-          url = "#{HOST_URL}#{uri.request_target}host/#{uri.host}/"
-        end
-
+      # Proxy URLs for video playback on invidious.
+      # Other API clients can get the original URLs by omiting `local=true`.
+      manifest = response.body.gsub(/<BaseURL>[^<]+<\/BaseURL>/) do |baseurl|
+        url = baseurl.lchop("<BaseURL>").rchop("</BaseURL>")
+        url = HttpServer::Utils.proxy_video_url(url, absolute: true) if local
         "<BaseURL>#{url}</BaseURL>"
       end
 
       return manifest
     end
 
-    adaptive_fmts = video.adaptive_fmts
-
+    # Ditto, only proxify URLs if `local=true` is used
     if local
-      adaptive_fmts.each do |fmt|
-        fmt["url"] = JSON::Any.new("#{HOST_URL}#{URI.parse(fmt["url"].as_s).request_target}")
+      video.adaptive_fmts.each do |fmt|
+        fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s, absolute: true))
       end
     end
 
@@ -178,7 +171,8 @@ module Invidious::Routes::API::Manifest
 
     if local
       manifest = manifest.gsub(/^https:\/\/\w+---.{11}\.c\.youtube\.com[^\n]*/m) do |match|
-        path = URI.parse(match).path
+        uri = URI.parse(match)
+        path = uri.path
 
         path = path.lchop("/videoplayback/")
         path = path.rchop("/")
@@ -207,7 +201,7 @@ module Invidious::Routes::API::Manifest
           raw_params["fvip"] = fvip["fvip"]
         end
 
-        raw_params["local"] = "true"
+        raw_params["host"] = uri.host.not_nil!
 
         "#{HOST_URL}/videoplayback?#{raw_params}"
       end
diff --git a/src/invidious/routes/embed.cr b/src/invidious/routes/embed.cr
index 266f7ba4..00f24159 100644
--- a/src/invidious/routes/embed.cr
+++ b/src/invidious/routes/embed.cr
@@ -157,10 +157,12 @@ module Invidious::Routes::Embed
     adaptive_fmts = video.adaptive_fmts
 
     if params.local
-      fmt_stream.each { |fmt| fmt["url"] = JSON::Any.new(URI.parse(fmt["url"].as_s).request_target) }
-      adaptive_fmts.each { |fmt| fmt["url"] = JSON::Any.new(URI.parse(fmt["url"].as_s).request_target) }
+      fmt_stream.each { |fmt| fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s)) }
     end
 
+    # Always proxy DASH streams, otherwise youtube CORS headers will prevent playback
+    adaptive_fmts.each { |fmt| fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s)) }
+
     video_streams = video.video_streams
     audio_streams = video.audio_streams
 
diff --git a/src/invidious/routes/watch.cr b/src/invidious/routes/watch.cr
index aabe8dfc..16f6d114 100644
--- a/src/invidious/routes/watch.cr
+++ b/src/invidious/routes/watch.cr
@@ -121,10 +121,12 @@ module Invidious::Routes::Watch
     adaptive_fmts = video.adaptive_fmts
 
     if params.local
-      fmt_stream.each { |fmt| fmt["url"] = JSON::Any.new(URI.parse(fmt["url"].as_s).request_target) }
-      adaptive_fmts.each { |fmt| fmt["url"] = JSON::Any.new(URI.parse(fmt["url"].as_s).request_target) }
+      fmt_stream.each { |fmt| fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s)) }
     end
 
+    # Always proxy DASH streams, otherwise youtube CORS headers will prevent playback
+    adaptive_fmts.each { |fmt| fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s)) }
+
     video_streams = video.video_streams
     audio_streams = video.audio_streams