100	Continue
101	Switching protocols
102	Processing (WebDAV)
103	Early hints
200	OK
201	Created
202	Accepted
203	Non authoritative information
204	No content
205	Reset content
206	Partial content
207	Multi-status (WebDAV)
208	Already reported (WebDAV)
226	Im used (HTTP Delta encoding)
300	Multiple choices
301	Moved permanently
302	Found
303	See other
304	Not modified
305	Use proxy deprecated
306	Switch Proxy
307	Temporary redirect
308	Permanent redirect
400	Bad request
401	Unauthorized
402	Payment required (experimental)
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	Payload too large
414	Uri too long
415	Unsupported media type
416	Range not satisfiable
417	Expectation failed
418	I'm a teapot
421	Misdirected request
422	Unprocessable entity
423	Locked (WebDAV)
424	Failed dependency (WebDAV)
425	Too early (experimental)
426	Upgrade required
428	Precondition required
429	Too many requests
431	Request
444	Instruct nginx to close the connection
451	Unavailable for legal reasons
500	Internal server error
501	Not implemented
502	Bad gateway
503	Service unavailable
504	Gateway timeout
505	Not supported
506	Variant also negotiates
507	Insufficient storage (WebDAV)
508	Loop detected (WebDAV)
510	Not extended
511	Network authentication required
419	Page Expired (Laravel Framework)
420	Method Failure (Spring Framework)/Enhance Your Calm (Twitter)
430	Request Header Fields Too Large (Shopify)
450	Blocked by Windows Parental Controls (Microsoft)
498	Invalid Token (Esri)Invalid Token (Esri)
509	Bandwidth Limit Exceeded (Apache Web Server/cPanel)
529	Site is overloaded (Qualys)
598	(Informal convention) Network read timeout error
599	Network Connect Timeout Error
440	Login Time-out (IIS)
449	Retry With (IIS)
451	Redirect (IIS)
444	No Response (nginx)
494	Request header too large (nginx)
495	SSL Certificate Error (nginx)
496	SSL Certificate Required (nginx)
497	HTTP Request Sent to HTTPS Port (nginx)
499	Client Closed Request (nginx) / Token Required (Esri)
520	Web Server Returned an Unknown Error (Cloudflare)
521	Web Server Is Down (Cloudflare)
522	Connection Timed Out (Cloudflare)
523	Origin Is Unreachable (Cloudflare)
524	A Timeout Occurred (Cloudflare)
525	SSL Handshake Failed (Cloudflare)
526	Invalid SSL Certificate (Cloudflare)
527	Railgun Error (Cloudflare)
530	Site is frozen (Pantheon) / returned along with a 1xxx error (Cloudflare)
460	Client closed the connection with the load balancer before the idle timeout period elapsed. Typically when client timeout is sooner than the Elastic Load Balancer's timeout. (Amazon's Elastic Load Balancing)
463	The load balancer received an X-Forwarded-For request header with more than 30 IP addresses. (Amazon's Elastic Load Balancing)
561	Unauthorized (Amazon's Elastic Load Balancing)
110	Response is Stale (obsoleted)
111	Revalidation Failed (obsoleted)
112	Disconnected Operation (obsoleted)
113	Heuristic Expiration (obsoleted)
199	Miscellaneous Warning (obsoleted)
214	Transformation Applied (obsoleted)
299	Miscellaneous Persistent Warning (obsoleted)