Are there any conflicts today that are similar to the Boxer Rebellion?
To answer this, we need to think about what the Boxer Rebellion was about. It was about the desire on the part of some Chinese to stop their country from being dominated, politically and socially, by Westerners. Seeing that, we must now think about whether there are uprisings today that are meant to prevent domination of one country by outsiders.
Depending on your point of view, you might see the conflicts in Iraq and Afghanistan (today, Afghanistan is more like this) in this way. You might say that the people of these countries are trying to rid themselves of unwanted intrusions by the US and other Western countries. I do not agree with this, but you can make this argument.