Since yesterday (?), I noticed that some images show just fine on the Stack Exchange sites but some don't.
For example, the uploaded image of this question on Cross Validated is shown like this (the image is not rendered):
and when I click the link, instead of the image, I see an error message:
oh no, that request didn't look right
RayID: 8a5f31156a098622
But on the same site, the uploaded image of this question is shown just fine:
I first thought it might be related to image size but the second image is fairly large. Why are some images shown correctly while others aren't?
The same thing happens on Stack Overflow too. For example, the images of this post show up just fine, but the images of this post don't.