Carnegie Mellon University Delphi Error Example

{
  "x-provenance": {
    "generated": "2026-08-19",
    "method": "probed",
    "source": "https://api.delphi.cmu.edu/epidata/fluview/",
    "authorship": "Captured live by API Evangelist from the institution-operated endpoint named in source; payload truncated for size, values unedited.",
    "notes": "Delphi returns parameter errors with HTTP 200 and signals failure in `result` (-1). A client keying only on the HTTP status reads this as a success."
  },
  "example": {
    "epidata": [],
    "message": "missing parameter: need [epiweeks, regions]",
    "result": -1
  }
}