I’m not sure that here is the right place to post(so sorry if it is
but it seems that WEBrick is not being maintained any more.
I found that WEBricks freezes with 100% of CPU usage whenever it takes a
POST message of invalid format(multipart/form-data with invalid
boundary). Then the server is able to process any other requests no
Be careful if you’re doing some serious things with script/server.