CSV previews are sometimes broken

[unoduetre]

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What

We have had issues with CSV previews for some time, and work has been done to resolve them. However they seem to be occurring again (see Examples below). The purpose of this card is to investigate what’s going wrong and suggest a fix.

Examples

• Visit https://www.gov.uk/government/statistics/postcode-level-gas-statistics-2021-experimental and click view online for the first CSV attachment
• Visit https://www.gov.uk/government/statistics/legal-aid-statistics-april-to-june-2023-data-files and click view online for the first CSV attachment

Why

Trello card

Screenshots?

No user-visible changes.

[unoduetre]

https://assets.integration.publishing.service.gov.uk/media/63d0e5e9e90e071ba56e0eab/Postcode_level_gas_2021.csv/preview
https://assets.integration.publishing.service.gov.uk/media/65153d216dfda600148e3751/legal-aid-statistics-main-data-apr-jun-2023.csv/preview

[hannako]

Thanks Mat, this is great, and I agree with your comment in the trello card about work to limit the number of lines sent from asset manager.

I feel like this controller is now a bit out of hand though - it's become so bloated. We could either refactor here or if you prefer, we could merge this work and then refactor in a fresh PR?

[unoduetre]

As discussed, let's merge it, so we can make sure the problem is resolved and then do the refactoring as a separate PR.

[hannako]

Thank you Mat 🥇

[unoduetre]

Gonna merge tomorrow morning.