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Content Negotiation

Accept

IANA permanent request RFC 9110 2 spellings

Declared by 183 providers across 4889 published specification files in the APIs.io network.

What this header is for, and how to use it →

A count here is providers whose published contract declares this header — not providers who send it. Response headers set at the edge rarely appear in an OpenAPI at all, so a low number can measure documentation practice rather than deployment.

Spelled 2 ways

HTTP field names are case-insensitive (RFC 9110 §5.1), so every spelling below is the same header on the wire. A contract is not the wire: generated clients key off the string, and a developer reading two of these sees two different headers.

Acceptaccept

The registry

Statuspermanent
ReferenceRFC 9110, Section 12.5.1: HTTP Semantics

Providers declaring it (183)

8x8 abnormal aemo ai21-labs aimlapi airbus-oneatlas airflow airtm akamai alianza altr amazon-bedrock amazon-codeguru-profiler amazon-medialive amazon-nova ankorstore apache-couchdb artifactory athena-health bazaarvoice benzinga bigcommerce boxc bud-co careacademy cashfree cdisc cdk-global cerebrium chaitin cloudquery cms-gov cobee commonwealth-bank conjur convelio copper-co crystal-reports cvent-social-tables dad-jokes deliverect deutsche-boerse digital-ocean dnv drupal dsv dwolla dyspatch ebay elsevier engineering-platform etsi expedia-group factset fal-ai fireworks-ai flexa form3 genlogs gingr github gonitro google helidon hitchpin hubspot hugging-face-transformers humanitec ibm-translate imf influxdata influxdb intercom international-business-machines itsacheckmate jaggaer jefferson-health jp-morgan-chase just-eat kadence keycorp koin kore-wireless koyeb langchain langsmith lichess lightspeed-pos lucid lufthansa microsoft-azure moonshot-ai moveworks mx-technologies newstore nexthink nhs-digital nhs-england ocient odata okta open-liberty oracle-hospitality orderful pagerduty palo-alto-networks partnerize pipedream plansource polysign postman pypi rainforest-qa reliance-jio render replicate rillet rocket-lawyer sageox salesforce salesloft sanctions-io sap-bi-tools sarj-ai-developer-api sendcloud sendgrid sentinel-hub site24x7 smallstep snowflake sparql speakeasy speakeasy-api speechify spiffe spp spring-framework spruceid stellaconnect sterling-check streamelements super-payments svn syniverse syntage talentlms telnyx temple-health tesslio the-climate-corporation thoughtspot timecamp tradeshift tradeverifyd truework tyro university-of-chicago uploadcare upwind upwind-security us-bancorp userpilot va-gov validere verdigris-technologies viator visa vital-io vsco vtex walmart wandb weavr websphere weights-and-biases wellsaid wikipedia wise worldcat worldpay wso2 yoobic zuora

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