I got 5 of these in yesterday and was rather disappointed to find they didn't work. TBH, I'm not sure if this has been posted here or not, searching for "relay" returns dozens of results, and these don't actually have a real part# on them. But if it hasn't been posted, this what I did to make it work. Much of the path I followed was based upon a youtube video in Russian that I found someone to translate for me.
First problem is that CHPD isn't connected to VCC. That was just a simple jumper across the bottom pins. The video shows the jumping them across the ESP-01 board. I just preferred to do it across the bottom.
Second is that the signal out is attached to GPIO0 not GPIO2. I cut the trace and then soldered in a jumper between the far side of the cut and GPIO2.
Third was the board wouldn't boot. This was resolved by soldering a 3.3K resistor from VCC to GPIO2.
The video talks about changing out R1, I did not do this as I found the board worked fine with the above changed. Didn't feel the need to mess around with SMD's if it wasn't necessary.
Now it boots up fine, and the relay functions properly when sent commands from the web.