HTTP Status 400 Codes (shopify)
Information about HTTP status codes 400 to 499, their meaning, and any related restrictions.
HTTP code 400 - Client Error
Description
An error situation occurred which seems to be caused by the client. Information about the error should be returned and displayed unless a HEAD request was performed.
Request Header Fields Too Large
Issued by Shopify to indicate a rate-limit effect. This is used instead of 429.