{
    "id": "http://trec-kba.org/schemas/v1.0/http-metadata.json",
    "description": "Metadata for corpus items fetched via HTTP.",
    "type": "object",
    "$schema": "http://json-schema.org/draft-03/schema#",
    "properties": {
        "$schema": {
            "description": "URI of this JSON schema document.",
            "type": "string",
            "enum": [
                "http://trec-kba.org/schemas/v1.0/http-metadata.json",
                "http://trec-kba.org/schemas/v1.0/news-metadata.json",
                "http://trec-kba.org/schemas/v1.0/linking-metadata.json"
                ],
            "required": false,
            "default": "http://trec-kba.org/schemas/v1.0/http-metadata.json"
            },
	"http_status": {
            "description": "HTTP response code (generated by fetcher)",
            "type": "integer",
            "required": true
            },
	"http_headers": {
            "description": "HTTP headers from host web site.  The keys and values are always encoded with python v2.7.2 String.encode('string-escape') (generated by fetcher)",
            "type": "object",
            "required": true
            },
	"redirect_chain": {
            "description": "Array of HTTP headers from the sequence of HTTP redirects that occurred while fetching the content.  While redirects are normal and occur often, the presence of redirects carries a higher probability that the fetcher hit a 'pay wall' instead of obtaining the intended content. (generated by fetcher)",
            "type": "array",
            "required": false
            }
        }
    }