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The Bridgeline-Version header isn’t a real date in YYYY-MM-DD form.
400 Bad Request · type invalid_request
When it happens
You sent a Bridgeline-Version header that isn’t a valid calendar date, such as 2026-9-23, v1 or 2026-02-30.
What to do
Send Bridgeline-Version: 2026-09-23, or leave the header out to use the current version. See versioning.
{
"error": {
"type": "invalid_request",
"code": "INVALID_API_VERSION",
"message": "Bridgeline-Version must be a date like 2026-09-23.",
"param": "Bridgeline-Version",
"doc_url": "https://docs.bridgelinepf.com/errors#INVALID_API_VERSION",
"request_id": "req_8fJ2kQ9xLm4TzW7nB3cY5pDv"
}
}