Complete list of HTTP status codes
"100" : Continue
"101" : Switching Protocols
"102" : Processing (WebDAV;RFC 2518)
"200" : OK
"201" : Created
"202" : Accepted
"203" : Non-Authoritative Information (since HTTP/1.1)
"204" : No Content
"205" : Reset Content
"206" : Partial Content
"207" : Multi-Status(WebDAV; RFC 4918)
"208" : Already Reported (WebDAV; RFC 5842)
"226" : IM Used (RFC 3229)
"300" : Multiple Choices
"301" : Moved Permanently
"302" : Found
"303" : See Other (since HTTP/1.1)
"304" : Not Modified
"305" : Use Proxy (since HTTP/1.1)
"306" : Switch Proxy(no longer used)
"307" : Temporary Redirect(since HTTP/1.1)
"308" : Permanent Redirect (Experimental RFC; RFC 7238)
"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 Time-out
"409" : Conflict
"410" : Gone
"411" : Length Required
"412" : Precondition Failed
"413" : Request Entity Too Large
"414" : Request-URI Too Large
"415" : Unsupported Media Type
"416" : Requested range not satisfiable
"417" : Expectation Failed
"418" : I'm a teapot (RFC 2324)
"419" : Authentication Timeout (not in RFC 2616)
"420" : Method Failure (Spring Framework)
"420" : Enhance Your Calm (Twitter)
"421" : There are too many connections from your internet address(Unknown)
"422" : Unprocessable Entity(WebDAV; RFC 4918)
"423" : Locked(WebDAV; RFC 4918)
"424" : Failed Dependency (WebDAV; RFC 4918)
"426" : Upgrade Required(RFC 2817)
"428" : Precondition Required (RFC 6585)
"429" : Too Many Requests (RFC 6585)
"431" : Request Header Fields Too Large (RFC 6585)
"440" : Login Timeout (Microsoft)
"444" : No Response (Nginx)
"449" : Retry With(Microsoft)
"450" : Blocked by Windows Parental Controls (Microsoft)
"451" : Unavailable For Legal Reasons (Internet draft)
"451" : Redirect (Microsoft)
"494" : Request Header Too Large (Nginx)
"495" : Cert Error (Nginx)
"496" : No Cert (Nginx)
"497" : HTTP to HTTPS (Nginx)
"498" : Token expired/invalid (Esri)
"499" : Client Closed Request (Nginx)
"499" : Token required (Esri)
"500" : Internal Server Error
"501" : Not Implemented
"502" : Bad Gateway
"503" : Service Unavailable
"504" : Gateway Time-out
"505" : HTTP Version not supported
"506" : Variant Also Negotiates(RFC 2295)
"507" : Insufficient Storage (WebDAV; RFC 4918)
"508" : Loop Detected (WebDAV; RFC 5842)
"509" : Bandwidth Limit Exceeded(Apache bw/limited extension)
"510" : Not Extended(RFC 2774)
"511" : Network Authentication Required (RFC 6585)
"598" : Network read timeout error (Unknown)
"599" : Network connect timeout error (Unknown)
"600" : Unparseable Response Headers
The above introduces the complete list of HTTP status codes, including relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.
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