How are you doing? vs how are going?

Some examples from the web:

• How are you doing? - I don't know...
• What was the experience like? How are you doing?
• How are you doing? (Your message is described here.)
• (Video) Man: How are you doing?
• how are you doing? - they're also the builders.
• Mr. Burkett, how are you doing?
• What - How are you doing?
• How are you doing? I haven't seen you for an age!
• Detectives, how are you doing?
• Welcome on Aristocrazia Webzine, how are you doing?
• Andrew, honey, how are you doing?
• Ginny, Phil, how are you doing?
• Granny, how are you doing? Vey well.
• Good morning Sir Ruini, how are you doing?
• So, Rose, how are you doing?
• So, Deva, how are you doing?
• The real question's how are you doing?
• I'm Mrs. Roberts and this is Officer Gardner, how are you doing?
• Scotty, my man, how are you doing?
• I just meant, how are you doing?

Some examples from the web:

• So, you know how things are going?
• DL: How are sales going?
• Joking aside, how are things going?
• Call me at lunch, let me know how things are going?
• Eve, how are things going?
• So, how are things going?
• Richard: «So how are things going?»
• Sir, how are things going?
• When Father is away and phones to ask, 'How are things going?', I learned that as soon as I said, 'Fine,' pandemonium would break loose again.
• About live shows, how are they going?
• Dare I ask how things are going over there?
• Players have arrived in all the areas requested and we're happy with how things are going. Goicoechea? Roma's squad consists of the players who will be training this afternoon.
• So how are your treatments going?
• First, though, how are your meetings going?
• So how are the interviews going?
• James, how fast are we going?
• So how are the lessons going?
• "How are sales going lately?"
• Anyway, how are the preparations going?
• So how are the ukulele lessons going?