missing ContentLength in s3.Object.get() response when requesting partial content

[gerazenobi]

Steps to reproduce:

from moto import mock_s3
import boto3

file_path = "..."
with mock_s3():
    bucket = "test"
    object_key = "key"
    s3 = boto3.resource("s3")
    s3.create_bucket(Bucket=bucket)
    with open(file_path, "rb") as file:
        s3.Object(bucket, object_key).put(Body=file)

    file = s3.Object(bucket, object_key)
    response = file.get(Range="bytes=0-1024")
    print(response["ContentLength"])

Expected behavior:

1025

Actual behavior:

KeyError: 'ContentLength'

Additional information:
This only happens when requesting partial content. Possibly other important response's headers are ignored as well since the headers argument is not being used within _handle_range_header, as seen here.

Versions

• moto 1.3.14
• boto 2.49.0
• boto3 1.13.3
• botocore 1.16.3

[RonRothman]

Greetings,

We're hitting this too, and it's breaking our tests. I see this has been open since May, and is labelled an "Enhancement." Is that just an oversight? Can we bump this up to "Bug?"

[bblommers]

Hi @RonRothman, my definition of a bug (in Moto's context) is anything that behaves differently from boto3.
In this case, the entire implementation is missing - and therefore the enhancement-label is more suitable IMO.

[RonRothman]

Thanks @bblommers, that makes sense. And I see that a fix is on the way--thanks for that as well!

[bblommers]

No problem @RonRothman!

This is now partof moto >= 1.3.16.dev79