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Der HTTP-Statuscode 428 Precondition Required Client-Fehlerreaktion zeigt an, dass der Server verlangt, dass die Anfrage konditional ist.
Typischerweise bedeutet eine 428-Antwort, dass ein erforderlicher Vorbedingungsheader wie If-Match fehlt.
Wenn ein Vorbedingungsheader nicht mit dem serverseitigen Zustand bereinstimmt, sollte die Antwort 412 Precondition Failed sein.
428 Precondition Required
Ein Client hat eine Ressource my-document vom Server geholt, sie lokal aktualisiert und versucht dann, das aktualisierte Dokument zurck an den Server zu senden:
PUT /docs/my-document HTTP/1.1
Host: example.com
Content-Type: application/json
{
[]
Die Serverimplementierung verlangt, dass alle PUT-Anfragen fr den spezifischen Pfad oder Dokumenttyp konditional sein mssen und sendet eine 428-Antwort:
HTTP/1.1 428 Precondition Required
Date: Wed, 26 Jun 2024 12:00:00 GMT
Server: Apache/2.4.1 (Unix)
Content-Type: application/json
{
"code": "MissingPrecondition",
"message": "Updating documents requires a precondition header.",
}
| Spezifikation |
|---|
| RFC 6585 # section-3 |
If-Match, If-None-Match, If-Modified-Since, If-Unmodified-Since, If-Range412Reason: CORS disabledReason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'Reason: CORS header 'Access-Control-Allow-Origin' missingReason: CORS header 'Origin' cannot be addedReason: CORS preflight channel did not succeedReason: CORS request did not succeedReason: CORS request external redirect not allowedReason: CORS request not HTTPReason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channelReason: Multiple CORS header 'Access-Control-Allow-Origin' not allowedAcceptAccept-CHAccept-EncodingAccept-LanguageAccept-PatchAccept-PostAccept-RangesAccess-Control-Allow-CredentialsAccess-Control-Allow-HeadersAccess-Control-Allow-MethodsAccess-Control-Allow-OriginAccess-Control-Expose-HeadersAccess-Control-Max-AgeAccess-Control-Request-HeadersAccess-Control-Request-MethodActivate-Storage-AccessAgeAllowAlt-SvcAlt-UsedAttribution-Reporting-EligibleAttribution-Reporting-Register-SourceAttribution-Reporting-Register-TriggerAuthorizationAvailable-DictionaryCache-ControlClear-Site-DataConnectionContent-DigestContent-DispositionContent-DPRContent-EncodingContent-LanguageContent-LengthContent-LocationContent-RangeContent-Security-PolicyContent-Security-Policy-Report-OnlyContent-TypeCookieCritical-CHCross-Origin-Embedder-PolicyCross-Origin-Embedder-Policy-Report-OnlyCross-Origin-Opener-PolicyCross-Origin-Resource-PolicyDateDevice-MemoryDictionary-IDDNTDownlinkDPREarly-DataECTETagExpectExpect-CTExpiresForwardedFromHostIdempotency-KeyIf-MatchIf-Modified-SinceIf-None-MatchIf-RangeIf-Unmodified-SinceIntegrity-PolicyIntegrity-Policy-Report-OnlyKeep-AliveLast-ModifiedLinkLocationMax-ForwardsNELNo-Vary-SearchObserve-Browsing-TopicsOriginOrigin-Agent-ClusterPermissions-PolicyPermissions-Policy-Report-OnlyPragmaPreferPreference-AppliedPriorityProxy-AuthenticateProxy-AuthorizationRangeRefererReferrer-PolicyRefreshReport-ToReporting-EndpointsRepr-DigestRetry-AfterRTTSave-DataSec-Browsing-TopicsSec-CH-Device-MemorySec-CH-DPRSec-CH-Prefers-Color-SchemeSec-CH-Prefers-Reduced-MotionSec-CH-Prefers-Reduced-TransparencySec-CH-UASec-CH-UA-ArchSec-CH-UA-BitnessSec-CH-UA-Form-FactorsSec-CH-UA-Full-VersionSec-CH-UA-Full-Version-ListSec-CH-UA-MobileSec-CH-UA-ModelSec-CH-UA-PlatformSec-CH-UA-Platform-VersionSec-CH-UA-WoW64Sec-CH-Viewport-HeightSec-CH-Viewport-WidthSec-CH-WidthSec-Fetch-DestSec-Fetch-ModeSec-Fetch-SiteSec-Fetch-Storage-AccessSec-Fetch-UserSec-GPCSec-Private-State-TokenSec-Private-State-Token-Crypto-VersionSec-Private-State-Token-LifetimeSec-PurposeSec-Redemption-RecordSec-Speculation-TagsSec-WebSocket-AcceptSec-WebSocket-ExtensionsSec-WebSocket-KeySec-WebSocket-ProtocolSec-WebSocket-VersionServerServer-TimingService-WorkerService-Worker-AllowedService-Worker-Navigation-PreloadSet-CookieSet-LoginSourceMapSpeculation-RulesStrict-Transport-SecuritySupports-Loading-ModeTETiming-Allow-OriginTkTrailerTransfer-EncodingUpgradeUpgrade-Insecure-RequestsUse-As-DictionaryUser-AgentVaryViaViewport-WidthWant-Content-DigestWant-Repr-DigestWarningWidthWWW-AuthenticateX-Content-Type-OptionsX-DNS-Prefetch-ControlX-Forwarded-ForX-Forwarded-HostX-Forwarded-ProtoX-Frame-OptionsX-Permitted-Cross-Domain-PoliciesX-Powered-ByX-Robots-TagX-XSS-Protection100 Continue101 Switching Protocols102 Processing103 Early Hints200 OK201 Created202 Accepted203 Non-Authoritative Information204 No Content205 Reset Content206 Partial Content207 Multi-Status208 Already Reported226 IM Used300 Multiple Choices301 Moved Permanently302 Found303 See Other304 Not Modified307 Temporary Redirect308 Permanent Redirect400 Bad Request401 Unauthorized402 Payment Required403 Forbidden404 Not Found405 Method Not Allowed406 Not Acceptable407 Proxy Authentication Required408 Request Timeout409 Conflict410 Gone411 Length Required412 Precondition Failed413 Content Too Large414 URI Too Long415 Unsupported Media Type416 Range Not Satisfiable417 Expectation Failed418 I'm a teapot421 Misdirected Request422 Unprocessable Content423 Locked424 Failed Dependency425 Too Early426 Upgrade Required428 Precondition Required429 Too Many Requests431 Request Header Fields Too Large451 Unavailable For Legal Reasons500 Internal Server Error501 Not Implemented502 Bad Gateway503 Service Unavailable504 Gateway Timeout505 HTTP Version Not Supported506 Variant Also Negotiates507 Insufficient Storage508 Loop Detected510 Not Extended511 Network Authentication Requiredbase-uriblock-all-mixed-contentchild-srcconnect-srcdefault-srcfenced-frame-srcfont-srcform-actionframe-ancestorsframe-srcimg-srcmanifest-srcmedia-srcobject-srcprefetch-srcreport-toreport-urirequire-trusted-types-forsandboxscript-srcscript-src-attrscript-src-elemstyle-srcstyle-src-attrstyle-src-elemtrusted-typesupgrade-insecure-requestsworker-srcaccelerometerambient-light-sensoraria-notifyattribution-reportingautoplaybluetoothbrowsing-topicscameracaptured-surface-controlch-ua-high-entropy-valuescompute-pressurecross-origin-isolateddeferred-fetchdeferred-fetch-minimaldisplay-captureencrypted-mediafullscreengamepadgeolocationgyroscopehididentity-credentials-getidle-detectionlanguage-detectorlanguage-modellocal-fontslocal-networklocal-network-accessloopback-networkmagnetometermicrophonemidion-device-speech-recognitionotp-credentialspaymentpicture-in-pictureprivate-state-token-issuanceprivate-state-token-redemptionpublickey-credentials-createpublickey-credentials-getscreen-wake-lockserialspeaker-selectionstorage-accesssummarizertranslatorusbweb-sharewindow-managementxr-spatial-trackingDer 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