ITV downloads take longer as XML downloading is tried (and fails) for each episode

[InternalLoss]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.11.22
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.itv.com/hub/im-a-celebrity-get-me-out-of-here/1a7103a0233']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.11.22
[debug] Python version 3.7.5 (CPython) - Darwin-19.2.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.2.1, ffprobe 4.2.1, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Using fake IP 25.70.148.176 (GB) as X-Forwarded-For.
[ITV] 1a7103a0233: Downloading webpage
[ITV] 1a7103a0233: Downloading XML
WARNING: Unable to download XML: HTTP Error 504: Gateway Time-out
[ITV] 1a7103a0233: Downloading JSON metadata
[ITV] 1a7103a0233: Downloading m3u8 information
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on 'https://itvpnpdotcom-a.akamaihd.net/1-7103-0233-001/18/1/VAR012/1-7103-0233-001_18_1_VAR012.ism/1-7103-0233-001_18_1_VAR012-audio=97151-video=1443000.m3u8'
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 553
[download] Destination: Episode 5-1a7103a0233.mp4

Description

This seems to be more of a malfunction directly than a bug, but when downloading ITV content, the tool seems to try to download an XML which always returns 504 Gateway Time Out. While I am not knowledgable about what this XML is used for, it doesn't seem to be required to downloading ITV files (as the JSON downloads fine) and therefore I suggest it could be removed.