doOn* callbacks execute BEFORE propagating the signal further, whereas doAfter* execute after.

doOnSubscribe at least has misleading phrasing making it look like the handler is executed after the Subscription has been passed to downstream, which is not the case.

that is to say when a Subscription has been produced by the Publisher
**and passed to the `Subscriber#onSubscribe(

Ideas:

• Set a minimum dimension for images.
• Find a way to detect dimensions before downloading the image.

I'm trying a simple test with tcpliveplay but it seems tcpliveplay doesn't handle TCP handshake properly.
Let me describe the steps from my testing.

1. Logged as root on machine A I ran this command to capture all the traffic to the host 104.31.95.22 (my website).

# tcpdump host 104.31.95.22 -n -s 65535 -w http.pcap

2. In another shell instance under the same machine I performed a