Use HTTP pools for image requests to YouTube

src/invidious.cr

@@ -92,6 +92,14 @@ SOFTWARE = {
 
 YT_POOL = YoutubeConnectionPool.new(YT_URL, capacity: CONFIG.pool_size)
 
+# Image request pool
+
+GGPHT_POOL = YoutubeConnectionPool.new(URI.parse("https://yt3.ggpht.com"), capacity: CONFIG.pool_size)
+
+# Mapping of subdomain => YoutubeConnectionPool
+# This is needed as we may need to access arbitrary subdomains of ytimg
+YTIMG_POOLS = {} of String => YoutubeConnectionPool
+
 # CLI
 Kemal.config.extra_options do |parser|
   parser.banner = "Usage: invidious [arguments]"