Yeah, like I said, it's S-canon in my head (secondary canon, which is has bits of truth and can be overridden). I know that I was speaking with someone on the previous page about this, who asked me which bits I think are and aren't true. To the best of my knowledge, here is how I reckon it:
Han and Chewie did not meet in the way depicted in the film, although it is true that Han served on Mimban briefly. Neither did Han's and Lando's meeting occur as it did on-screen.
Solo is Han's birth name.
Since we know most of Han's previous flames, and know that he was only serious about one girl prior to meeting Leia, we can assume that Qi'ra was probably just a friend of Han's, they were not that close and certainly not romantic, or if they were, it was fleeting.
L3-37 does not exist, although it may be true that either Han or Lando acquired a protocol droid's brain and incorporated it into the Falcon. That tale has not been told.
The Sabacc game where Han won the Falcon from Lando occurred on Bespin, not on that planet depicted in the film.
The Kessel Run is pretty close, although the Maw contains three black holes, not just one.
Darth Maul could still be the head of that criminal organization (I can't recall the name at the moment), Qi'ra may be involved, and that main villain (I also cannot recall his name) may also exist.
Han's mentor (man, I am really sucking at this tonight) is sort of based on a "real" person whom Han knew: Garus Shrike.
So yeah, in my opinion, the film is an in-universe holodrama filmed with some actors to honor Han Solo, but takes many liberties, as I explained on the previous page.