python - SparqlWrapper 错误 - urllib.error.HTTPError：HTTP 错误 406：不可接受

Question

请在下面找到查询，406当我尝试查询 sparql 端点时会出错。我不确定为什么。谁能帮我解决这个问题？提前致谢。

from SPARQLWrapper import SPARQLWrapper, JSON, POST, DIGEST
import json

sparql = SPARQLWrapper("http://losd.staging.derilinx.com:8890/")
sparql.setCredentials("*******", "********")

query = """
        prefix concpt: <http://ld.linked-open-statistics.org/data/conceptscheme/>
        prefix vocb: <http://ld.linked-open-statistics.org/vocab/>
        prefix data: <http://ld.linked-open-statistics.org/data/>

        select * where {
        ?s ?p ?o .
        }
    """
sparql.addDefaultGraph("http://unemp_rate.italy..staging.derilinx.com")
sparql.setHTTPAuth(DIGEST)
sparql.setQuery(query)
sparql.setReturnFormat(JSON)
results = sparql.query().convert()

错误：

raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 406: Unacceptable