Is the bodywell-formedand yet stillinvalid?Yes4XX ResponseIs the userbeingthrottled?420Enhance Your CalmYesDoes the userneed toauthenticate?NoAre you usingHTTP auth?Yes401UnauthorizedYes403ForbiddenNoDoes the userhave access to theresource?NoNoDoes theresource evenexist?YesIs theresource asecret?NoYes404Not FoundAre yourage-quitting theinternet?NoNo410GoneYesIs the HTTPmethod handledby the resource?Yes405Method Not AllowedNoAcceptHeader406Not Acceptable415Unsupported Media Type417Expectation FailedAre youimplementing aweb server?NoProblemwith theheaders?YesYes422Unprocessable EntityYesNoRequestincompatible witha previousrequest?409ConflictYes411Length RequiredNo408Request Timeout413Payload Too Large414URI Too Long426Upgrade Required400Bad RequestNo416Range NotSatisfiable412Precondition FailedContent-LengthIf-*Content-TypeExpectOtherAre youTwitter?Yes429Too Many RequestsNoIs it April1st?No418I'm a TeapotYes