Http status codes. As per https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml

enum HttpStatusCode {
  Continue: 100
  SwitchingProtocols: 101
  Processing: 102
  EarlyHints: 103
  Ok: 200
  Created: 201
  Accepted: 202
  NonAuthoritativeInformation: 203
  NoContent: 204
  ResetContent: 205
  PartialContent: 206
  MultiStatus: 207
  AlreadyReported: 208
  ImUsed: 226
  MultipleChoices: 300
  MovedPermanently: 301
  Found: 302
  SeeOther: 303
  NotModified: 304
  UseProxy: 305
  Unused: 306
  TemporaryRedirect: 307
  PermanentRedirect: 308
  BadRequest: 400
  Unauthorized: 401
  PaymentRequired: 402
  Forbidden: 403
  NotFound: 404
  MethodNotAllowed: 405
  NotAcceptable: 406
  ProxyAuthenticationRequired: 407
  RequestTimeout: 408
  Conflict: 409
  Gone: 410
  LengthRequired: 411
  PreconditionFailed: 412
  PayloadTooLarge: 413
  UriTooLong: 414
  UnsupportedMediaType: 415
  RangeNotSatisfiable: 416
  ExpectationFailed: 417
  ImATeapot: 418
  MisdirectedRequest: 421
  UnprocessableEntity: 422
  Locked: 423
  FailedDependency: 424
  TooEarly: 425
  UpgradeRequired: 426
  PreconditionRequired: 428
  TooManyRequests: 429
  RequestHeaderFieldsTooLarge: 431
  UnavailableForLegalReasons: 451
  InternalServerError: 500
  NotImplemented: 501
  BadGateway: 502
  ServiceUnavailable: 503
  GatewayTimeout: 504
  HttpVersionNotSupported: 505
  VariantAlsoNegotiates: 506
  InsufficientStorage: 507
  LoopDetected: 508
  NotExtended: 510
  NetworkAuthenticationRequired: 511
}

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