Bad server response : how to debug

[rinorway]

I'd like some advice on how to debug "bad server responses"

For example this reproducible one in 4.02 when calling /api/v1/KnowledgeBaseArticle/layout/massUpdate, occurring when using mass update in the knowledge base.

Is there any recommended approach to facilitate debugging of this?

[yuri]

Always first you need to check is a server's error log.

[yuri]

But it your case the cause is obvious. Missing comma in JSON.

[rinorway]

Thanks, precise reading So fix is /application/Espo/Modules/Crm/Resources/layouts/KnowledgeBaseArticle/massUpdate.json