[Generic] `Referer` header required to video download

[bato3]

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• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.06.25. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2018.06.25

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

youtube-dl -v https://vidfile.net/v/5985p4s334p19
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://vidfile.net/v/5985p4s334p19']
[debug] Encodings: locale cp1250, fs mbcs, out cp852, pref cp1250
[debug] youtube-dl version 2018.06.25
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17134
[debug] exe versions: phantomjs 2.1.1
[debug] Proxy map: {}
[generic] 5985p4s334p19: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 5985p4s334p19: Downloading webpage
[generic] 5985p4s334p19: Extracting information
[download] Downloading playlist: [anon] KiraKira Precure La Mode - 25 [1280x720].mp4 • VidFile.net
[generic] playlist [anon] KiraKira Precure La Mode - 25 [1280x720].mp4 • VidFile.net: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[debug] Default format spec: best/bestvideo+bestaudio
[debug] Invoking downloader on 'https://s2.vidfile.net/file/dafd92960b79c27dc29ccf9c922debec/d22e301f0df4b1a4a9506c82f97374bac0429036f81d2a1350e13fbac56b9c2468808aef66326bd86ab24b2ea541a47bc6ac51677b84cbe62d74ae6e0b0457bb/1530191959/5985c4f334c19.mp4'
[download] Destination: [anon] KiraKira Precure La Mode - 25 [1280x720].mp4 • VidFile.net-5985p4s334p19.mp4
[download] 100% of 65.93KiB in 00:00
[download] Finished downloading playlist: [anon] KiraKira Precure La Mode - 25 [1280x720].mp4 • VidFile.net

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Description of your issue, suggested solution and other information

Some servers require referrer header. When I provide it manually, download works:

youtube-dl  --add-header Referer:https://vidfile.net/v/5985p4s334p19  https://vidfile.net/v/5985p4s334p19
[generic] 5985p4s334p19: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 5985p4s334p19: Downloading webpage
[generic] 5985p4s334p19: Extracting information
[download] Downloading playlist: [anon] KiraKira Precure La Mode - 25 [1280x720].mp4 • VidFile.net
[generic] playlist [anon] KiraKira Precure La Mode - 25 [1280x720].mp4 • VidFile.net: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[download] Destination: [anon] KiraKira Precure La Mode - 25 [1280x720].mp4 • VidFile.net-5985p4s334p19.mp4
[download]  24.4% of 391.14MiB at 419.10KiB/s ETA 12:02

I suggest that this header be added by default.