照片的尺寸是以英寸为单位，1英寸=2.54cm ，通常x寸是指照片长的一边的英寸长度。 身份证、体检表等多采用小一寸22×32mm， 第二代身份证 26mm×32mm，普通一寸相. 知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业. A bit of explaining as to what that %2520 is :
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The % character is encoded as %25.
As the aforementioned rfc does not include any reference of encoding spaces as +, i guess using %20 is the way to go today.
The common space character is encoded as %20 as you noted yourself.
