evazion 44f826d8fa nicoseiga: optimize image_url method. ...

The image_url method makes a request to `https://seiga.nicovideo.jp/images/source/:image_id`
to see where this URL redirects to. Before we did a GET request, which caused it to download
the full image. This could fail with a timeout error if the download took too long. We also
cached the request, which caused the full image to be cached, even though we only need the
headers. Change it to a HEAD request so we don't have to download the entire image just to
check the URL.

2020-06-24 22:54:04 -05:00

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