Mchlrch added a comment.

The endpoint https://ld.stadt-zuerich.ch/query supports HTTP/1.0, HTTP/1.1 and HTTP/2. I defaults to HTTP/2, if the client does request an explicit version.

@Smalyshev How about explicitly specifying HTTP/1.1 for the jetty-client?

Query:

$ cat foo.rq 
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT * WHERE {
  GRAPH <https://linked.opendata.swiss/graph/zh/statistics> {
    ?sub ?pred ?obj .
  } 
}
LIMIT 1

curl for HTTP/1.0:

$ curl --http1.0 -i --data-urlencode [email protected] https://ld.stadt-zuerich.ch/query
HTTP/1.0 200 OK
Accept-Ranges: bytes
Access-Control-Allow-Origin: *
Age: 0
Cache-Control: public, max-age=120
Content-Type: application/sparql-results+xml
Date: Tue, 28 Aug 2018 11:54:40 GMT
Set-Cookie: _f3bc9=http://10.42.34.100:80; Path=/
Vary: Accept-Encoding
Vary: Accept, Accept-Encoding
Via: 1.1 varnish-v4
X-Varnish: 296846
Content-Length: 540

<?xml version='1.0' encoding='UTF-8'?>
<sparql xmlns='http://www.w3.org/2005/sparql-results#'>
	<head>
		<variable name='sub'/>
		<variable name='pred'/>
		<variable name='obj'/>
	</head>
	<results>
		<result>
			<binding name='sub'>
				<uri>https://ld.stadt-zuerich.ch/.well-known/void</uri>
			</binding>
			<binding name='pred'>
				<uri>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</uri>
			</binding>
			<binding name='obj'>
				<uri>http://rdfs.org/ns/void#DatasetDescription</uri>
			</binding>
		</result>
	</results>
</sparql>

curl for HTTP/1.1:

$ curl --http1.1 -i --data-urlencode [email protected] https://ld.stadt-zuerich.ch/query
HTTP/1.1 200 OK
Accept-Ranges: bytes
Access-Control-Allow-Origin: *
Age: 0
Cache-Control: public, max-age=120
Content-Type: application/sparql-results+xml
Date: Tue, 28 Aug 2018 11:54:18 GMT
Set-Cookie: _f3bc9=http://10.42.34.100:80; Path=/
Vary: Accept-Encoding
Vary: Accept, Accept-Encoding
Via: 1.1 varnish-v4
X-Varnish: 1540376
Content-Length: 540

<?xml version='1.0' encoding='UTF-8'?>
<sparql xmlns='http://www.w3.org/2005/sparql-results#'>
	<head>
		<variable name='sub'/>
		<variable name='pred'/>
		<variable name='obj'/>
	</head>
	<results>
		<result>
			<binding name='sub'>
				<uri>https://ld.stadt-zuerich.ch/.well-known/void</uri>
			</binding>
			<binding name='pred'>
				<uri>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</uri>
			</binding>
			<binding name='obj'>
				<uri>http://rdfs.org/ns/void#DatasetDescription</uri>
			</binding>
		</result>
	</results>
</sparql>

TASK DETAIL
https://phabricator.wikimedia.org/T202785

EMAIL PREFERENCES
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To: Smalyshev, Mchlrch
Cc: Mchlrch, Gehel, Aklapper, Smalyshev, Lahi, Gq86, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, Jonas, Xmlizer, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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