Common response headers

    Apart from standard HTTP headers, Yandex Object Storage uses additional headers that can be present in responses.

    The table below describes additional headers as well as standard headers that need to be explained in more detail.

    Header Description
    ETag MD5 hash of an object if the object is uploaded as a single file. If the object is uploaded by the multipart upload, then to calculate the ETag, you need to get the MD5 hash sum of the uploaded parts (let's call it MD5_sum) and attach the number of parts (N) to the resulting string: "MD5_sum-N".

    Does not include object metadata.
    x-amz-request-id Unique request ID.

    You may need it when contacting the Yandex.Cloud support service if any problems occur.

    If a request is sent with CORS headers, the response may contain headers for a response to the options preflight request.