What this endpoint does

Performs a HEAD request on a Fusion file to retrieve metadata (ETag, Last-Modified, filename) without downloading the file content. Use this in polling workflows to check if a file has changed before downloading with Fusion Files: Get. To discover valid file paths, use Fusion Files: List Directory. Path values must be URL-encoded (forward slashes become %2F).

Response data

Returns HTTP headers only — no body. Key headers: ETag (file hash for change detection), Last-Modified (timestamp), and Content-Disposition (filename). Compare the ETag against a stored value to determine if the file has changed since last retrieval. Note: the spec documents a response body for 200, but HEAD requests never return a body.