Seeing exactly the same thing here. My Apache logs show the following when I try to connect.
166.177.122.80 – – [10/Jul/2023:09:12:08 -0500] “OPTIONS /opensprinkler//jo?pw=d41d8cd98f00b204e9800998ecf8427e HTTP/1.1” 401 381
166.177.122.80 – – [10/Jul/2023:09:12:08 -0500] “OPTIONS /opensprinkler/ HTTP/1.1” 401 381
166.177.122.80 – – [10/Jul/2023:09:12:29 -0500] “-” 408 –