5×× SERVER ERROR
507 INSUFFICIENT STORAGE
The method could not be performed on the resource because the server is unable to store the representation needed to successfully complete the request.
This condition is considered to be temporary. If the request that received this status code was the result of a user action, the request MUST NOT be repeated until it is requested by a separate user action.
507 INSUFFICIENT STORAGE Source: RFC4918 Section 11.5
507 CODE REFERENCES
Rails HTTP Status Symbol
Symfony HTTP Status Constant