other

HTTP response codes

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", 
300 => "Multiple Choices", 
301 => "Moved Permanently", 
302 => "Found", 
303 => "See Other", 
304 => "Not Modified", 
305 => "Use Proxy", 
306 => "(Unused)", 
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", 
419 => "Authentication Timeout", 
420 => "Enhance Your Calm", 
422 => "Unprocessable Entity", 
423 => "Locked", 
424 => "Failed Dependency", 
424 => "Method Failure", 
425 => "Unordered Collection", 
426 => "Upgrade Required", 
428 => "Precondition Required", 
429 => "Too Many Requests", 
431 => "Request Header Fields Too Large", 
444 => "No Response", 
449 => "Retry With", 
450 => "Blocked by Windows Parental Controls", 
451 => "Unavailable For Legal Reasons", 
494 => "Request Header Too Large", 
495 => "Cert Error", 
496 => "No Cert", 
497 => "HTTP to HTTPS", 
499 => "Client Closed Request", 
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", 
509 => "Bandwidth Limit Exceeded", 
510 => "Not Extended", 
511 => "Network Authentication Required", 
598 => "Network read timeout error", 
599 => "Network connect timeout error"

When creating an API you can get idea from the above list to send appropriate response HTTP status code.

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