HTTP Status 400 Codes (unofficial)
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.
Issued by Twitter Search and Twitter Trends version 1 when the client is rate limited. Subsequent versions use 429.
Request Header Fields Too Large
Issued by Shopify to indicate a rate-limit effect. This is used instead of 429.
Blocked by Windows Parental Controls
Issued by Microsoft when Windows Parental Controls are turned on and a resource is blocked.
Internal response that tells the server to close the connection and return no information.