The size of the photo is measured in inches, 1 inch = 2.54cm, usually x-inch refers to the length of the long side of the photo in inches. Identity cards, physical examination forms, etc. mostly use small one-inch 22×32mm, second-generation ID cards use 26mm×32mm, and ordinary one-inch photos. Zhihu, a high-quality Q&A community on the Chinese Internet and an original content platform where creators gather, was officially launched in January 2011 with the brand mission of "allowing people to better share knowledge, experience and insights, and find their own answers." Zhihu relies on seriousness and professionalism. A bit of explaining as to what that %2520 is :
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The % character is encoded as %25. The common space character is encoded as %20 as you noted yourself. As the aforementioned rfc does not include any reference of encoding spaces as +, i guess using %20 is the way to go today.
