writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
				return
			}
		}
		// Set this for multipart only operations, we need to differentiate during
		// decryption if the file was actually multipart or not.
		encMetadata[ReservedMetadataPrefix+"Encrypted-Multipart"] = ""
	}

	// Extract metadata that needs to be saved.
	metadata, err := extractMetadataFromReq(ctx, r)