REASON_PHRASES is a dictionary containing 59 initial entries: 'CONTINUE' for 100, 'SWITCHING PROTOCOLS' for 101,
REASON_PHRASES = { 100 : 'CONTINUE' , 101 : 'SWITCHING PROTOCOLS' , 102 : 'PROCESSING' , 200 : 'OK' , 201 : 'CREATED' , 202 : 'ACCEPTED' , 203 : 'NON-AUTHORITATIVE INFORMATION' , 204 : 'NO CONTENT' , 205 : 'RESET CONTENT' , 206 : 'PARTIAL CONTENT' , 207 : 'MULTI-STATUS' , 208 : 'ALREADY REPORTED' , 226 : 'IM USED' , 300 : 'MULTIPLE CHOICES' , 301 : 'MOVED PERMANENTLY' , 302 : 'FOUND' , 303 : 'SEE OTHER' , 304 : 'NOT MODIFIED' , 305 : 'USE PROXY' , 306 : 'RESERVED' , 307 : 'TEMPORARY REDIRECT' , 308 : 'PERMANENT REDIRECT' , 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' , 416 : 'REQUESTED RANGE NOT SATISFIABLE' , 417 : 'EXPECTATION FAILED' , 418 : "I'M A TEAPOT" , 422 : 'UNPROCESSABLE ENTITY' , 423 : 'LOCKED' , 424 : 'FAILED DEPENDENCY' , 426 : 'UPGRADE REQUIRED' , 428 : 'PRECONDITION REQUIRED' , 429 : 'TOO MANY REQUESTS' , 431 : 'REQUEST HEADER FIELDS TOO LARGE' , 500 : 'INTERNAL SERVER ERROR' , 501 : 'NOT IMPLEMENTED' , 502 : 'BAD GATEWAY' , 503 : 'SERVICE UNAVAILABLE' , 504 : 'GATEWAY TIMEOUT' , 505 : 'HTTP VERSION NOT SUPPORTED' , 506 : 'VARIANT ALSO NEGOTIATES' , 507 : 'INSUFFICIENT STORAGE' , 508 : 'LOOP DETECTED' , 510 : 'NOT EXTENDED' , 511 : 'NETWORK AUTHENTICATION REQUIRED' , }