Coolio fans flocked to his website after his death to grab some merch ... and the response was so overwhelming, people were met with a big ol' "404 error."
The rapper's merch store was out of service as of Friday morning ... folks were unable to grab Coolio swag online -- instead seeing the message, "Page not found -- Somehow you have come to a page that does not exist."
Normally, a response like this would come up if the page were deleted, or because of heavy traffic. It looks like the latter is the culprit.
FYI -- the site normally has lots of great finds for Coolio fans ... stuff like fanny packs, mugs, hoodies and face masks.