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Summary:

  428 Precondition Required
  429 Too Many Requests
  431 Request Header Fields Too Large 
  511 Network Authentication Required
I've been using 414 Request-URI Too Long for 431 and 503 Service Temporarily Unavailable for 429


Apart from the obvious semantics, what's the difference between 428 and 412? (412 - precondition failed)


AFAICS, 412 is only meaningful when the request did specify a precondition (which failed), while 428 means that the request didn't specify some precondition (which was required by server).


"Apart from the semantics", the difference is 16.




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