[jaimex2]

"OpenAI technology, just an HTTPS call away"

'an' is only mean to proceed a vowel. Should say

"OpenAI technology, just a HTTPS call away"

[chad_oliver]

This depends how you pronounce 'h'. If you pronounce it "aitch", then "an HTTPS" is correct. If you pronounce it "haitch", then "a HTTPS" is correct. There's no universal pronunciation, and therefore no universally-right answer.

[wfme]

It depends how you pronounce "H". If you pronounce it aitch instead of haitch then using "an" in this context is totally correct. https://blog.apastyle.org/apastyle/2012/04/using-a-or-an-wit....

[jaimex2]

You're right! Wow, I never realised rules get changed by pronunciation before. It's not vowels at all but whatever sounds like one in the writers mind.