How to encode the plus (+) symbol in a URL - Stack Overflow
https://stackoverflow.com/questions/5450190/how-to-encode-the-plus-symbol-in-a-url
Jan 03, 2021 · So, percent-encode the plus character and other special characters. The problem that you are having with pluses is because, according to RFC-1866 (HTML 2.0 specification), paragraph 8.2.1. subparagraph 1., "The form field names and values are escaped: space characters are replaced by `+', and then reserved characters are escaped").
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