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The mechanism that applications use to communicate with Swarm is a text-based protocol based on HTTP. Known as theSimple Content Storage Protocol(SCSP), the methods and syntax are a proper subset of the HTTP/1.1 standard.

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Most HTTP communication is initiated by a client application and consists of a request to be applied to an object on a Swarm server. This is performed using a single connection between the client application and the Swarm server. Being HTTP-based, SCSP protocol consists of HTTP requests and responses:

• Requestsare generated by a Swarm client (that is, any HTTP/1.1 client), with these components:

  • Request method, with URI and protocol version

  • Case-insensitive query arguments

  • Required and optional headers

• Responsesare generated by one or more nodes in a storage cluster, with these components:

  • Status line, with the message's protocol version and a success or error code

  • MIME-like message, with server information, entity metadata, and possible entity-body content

See the  HTTP/1.1 specification for the semantics and nuances of HTTP.

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