/b/{bucket}/o/{object}

curl --location --request PUT 'https://storage.googleapis.com/storage/v1beta2/b//o/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "acl": [
        {
            "bucket": "string",
            "domain": "string",
            "email": "string",
            "entity": "string",
            "entityId": "string",
            "etag": "string",
            "generation": "string",
            "id": "string",
            "kind": "storage#objectAccessControl",
            "object": "string",
            "role": "string",
            "selfLink": "string"
        }
    ],
    "bucket": "string",
    "cacheControl": "string",
    "componentCount": 0,
    "contentDisposition": "string",
    "contentEncoding": "string",
    "contentLanguage": "string",
    "contentType": "string",
    "crc32c": "string",
    "etag": "string",
    "generation": "string",
    "id": "string",
    "kind": "storage#object",
    "md5Hash": "string",
    "mediaLink": "string",
    "metadata": {
        "property1": "string",
        "property2": "string"
    },
    "metageneration": "string",
    "name": "string",
    "owner": {
        "entity": "string",
        "entityId": "string"
    },
    "selfLink": "string",
    "size": "string",
    "storageClass": "string",
    "timeDeleted": "2019-08-24T14:15:22Z",
    "updated": "2019-08-24T14:15:22Z"
}'