HTTP backend client cleanup

[ash2k]

1. Don't need to close response body twice.
2. Pass data as []byte, no need to wrap in a reader. Wrapping causes an extra pointless copy.

[ash2k]

Hello there! Is something blocking this PR?

p.s. I'd like to add support for fetching HTTP backend configuration from environment variables. Would that be something that you would consider merging?

[ash2k]

Hello? =) 1 year has passed and this trivial PR still hasn't been reviewed.

[hashicorp-cla]

All committers have signed the CLA.

[ash2k]

2 years...

[crw]

Thanks for this submission! The reason it has not been reviewed (at least recently) is due to the general hold on backend reviews (see CONTRIBUTING.md#state-storage-backends. I will update this PR if/when that is lifted.

I suspect it was not reviewed historically both for the above reason, but also due to fear of unintentionally breaking something for http backend users in a part of the code that is otherwise not actively under development / does not have core developer attention on it at the moment. This is just my gut feeling about this PR, but hopefully gives a little insight behind the curtain when looking at even small PRs such as this.

Thanks again for your submission!

[ash2k]

Thanks for an update, appreciated.