Metadata Headers


Header Limits: Headers (metadata) are constrained not only by Swarm but by all services, proxies, and clients (such as Elasticsearch, Twisted, Jetty, and HAProxy) handling objects. A Swarm object may have any number of annotations associated with it, but each annotation object is subject to these limits. The persisted metadata on Swarm objects must fall within these limits by default:

  • 500 - The total number of headers on an object

  • 32 KB - The combined length of all headers (key/value pairs); exceeding this returns a 400 (Bad Request) error

  • 16 KB - The maximum length for a given header (key/value pair)

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