HTTP Status Code Definitions
4xx Client Errors

400

     Bad Request

401

     Unauthorized

402

     Payment Required

403

     Forbidden

404

     Not Found

405

     Method Not Allowed

406

     Not Acceptable

407

     Proxy Authentication Required

408

     Request Timeout

409

     Conflict

410

     Gone

411

     Length Required

412

     Precondition Failed

413

     Request Entity Too Large

414

     Request-URI Too Long

415

     Unsupported Media Type