Add YouTube-Client headers to HTTP requests

src/invidious/helpers/proxy.cr

@@ -86,6 +86,16 @@ class HTTPClient < HTTP::Client
 
     return opts
   end
+
+  def exec(request)
+    if self.host == "www.youtube.com"
+      request.headers["x-youtube-client-name"] = "1"
+      request.headers["x-youtube-client-version"] = "2.20180719"
+      request.headers["user-agent"] = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36"
+    end
+
+    super
+  end
 end
 
 def get_proxies(country_code = "US")