An answer of mine includes an URL with a ?, which is not correctly parsed. I think it should be.
Actually, I wanted to include the image that is autogenerated from the URL, to show a point of my answer, this did also not work.
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It is not the question mark that is at issue there. You need to properly quote your URL parameters; it is the backslash and braces that cause the query parameter to be ignored.
Rather than use:
The backslash, caret and braces are all quoted now, not just the
= equals signs.
This is recognised as a proper URL: https://latex.codecogs.com/png.latex?%5Csum%5E%7Bi%3D%5Cinfty%7D_%7Bi%3D0%7Dx_%7Bi%7D%7D
and is usable as an image: