Hurl.it was acquired and maintained by https://twilio.com for awhile.
Hurl.it was acquired and relaunched by https://runscope.com in 2013.
Hurl.it was acquired and relaunched by https://pipedream.com in 2021.
Then I started Runscope and we made a much better version of Hurl.it and RequestBin, but those two sites were by then linked in tons of API docs and we couldn't get those links switched to Runscope, so we acquired the links. Twilio was happy to get rid of it since they had actual infosec policies in place by that point and Hurl.it was regularly abused as an open proxy. Those two sites were the meat and bones of our marketing for most of pre-acquisition life of Runscope. We had direct links to Runscope for people who needed more features, and would tag visitors and retarget them later. Those audiences being shown an ad for a free, brilliantly-designed 'Everything is going to be 200 OK' t-shirt drove A LOT of sign ups.
Then we sold the company and I lost control of the domains to our acquirer.
Edit: Since Tod linked to hurlit.com instead of hurl.it, I assumed they had just cloned it but they also have the original domain hurl.it.
Still, hurl is the original and it's nice that it's back up.