wget下载豆瓣图片失败

使用wget下载豆瓣一张电影海报原图，结果：

$ wget https://img3.doubanio.com/view/photo/raw/public/p2177841410.jpg
--2020-11-06 09:26:21--  https://img3.doubanio.com/view/photo/raw/public/p2177841410.jpg
Resolving img3.doubanio.com (img3.doubanio.com)... 110.52.196.229, 61.240.226.231, 110.52.196.232, ...
Connecting to img3.doubanio.com (img3.doubanio.com)|110.52.196.229|:443... connected.
HTTP request sent, awaiting response... 403 Forbidden
2020-11-06 09:26:21 ERROR 403: Forbidden.

查找方法后，发现需要加上 --referer 参数:

wget中的参数说明：

       --referer=url
           Include `Referer: url' header in HTTP request.  Useful for
           retrieving documents with server-side processing that assume they
           are always being retrieved by interactive web browsers and only
           come out properly when Referer is set to one of the pages that
           point to them.

url填域名，再测试成功：

$ wget --referer="https://img3.doubanio.com" https://img3.doubanio.com/view/photo/raw/public/p2177841410.jpg
--2020-11-06 09:24:56--  https://img3.doubanio.com/view/photo/raw/public/p2177841410.jpg
Resolving img3.doubanio.com (img3.doubanio.com)... 110.52.117.8, 110.52.196.231, 61.240.226.230, ...
Connecting to img3.doubanio.com (img3.doubanio.com)|110.52.117.8|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2880307 (2.7M) [image/jpeg]
Saving to: ‘p2177841410.jpg’

p2177841410.jpg     100%[===================>]   2.75M  15.4MB/s    in 0.2s    

2020-11-06 09:24:57 (15.4 MB/s) - ‘p2177841410.jpg’ saved [2880307/2880307]