Blob storage content type and encoding

[jetuk]

I'm trying to upload to a blob store using .put_block_list. The upload is working OK except for specifying the content-type and content-encoding. My code snippet as follows:

let response = blob
    .put_block_list(block_list)
    .content_md5(hash)
    .content_type("application/json")
    .content_encoding("gzip")
    .into_future()
    .await?;

However, despite the request succeeding the content-type remains the default "application/octet-stream", and the content-encoding is unset. Looking at the headers sent in the request (according to the debug logging) I wonder if there is a problem here. The request specifies "content-type" and "content-encoding", but I understood these should be "x-ms-blob-content-type" and "x-ms-blob-content-encoding" respectively.