https://twitter.com/intent/tweet?source=webclient&text=G%C5
produces the following error:
Invalid Unicode value in one or more parameters
btw, that is the Å character
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twitter expects parameters to be encoded as utf-8.
So Å is Unicode U+00C5, and represented as utf-8 is C3 85
With url-escape this means that the query should be …&text=G%C3%85
Since I don’t know how you are building that query (programming language/environment), I can’t really tell you how to do it right. Only that you should convert your string to utf-8 before escaping.