HTTPPost problem. get 200 back, but no body

I’m sending an HTTP post to http://api.artsholland.com/sparql?apiKey=27b6abd4129fc9ced3aa5390fd4fb15b

with this query:

  
  string query =  
"PREFIX ah: <[http://purl.org/artsholland/1.0/>-](http://purl.org/artsholland/1.0/>-) "  
"PREFIX data: <[http://data.artsholland.com/>-](http://data.artsholland.com/>-) "  
"PREFIX nub: <[http://resources.uitburo.nl/>-](http://resources.uitburo.nl/>-) "  
"PREFIX rdf: <[http://www.w3.org/1999/02/22-rdf-syntax-ns/>-](http://www.w3.org/1999/02/22-rdf-syntax-ns/>-) "  
"PREFIX rdfs: <[http://www.w3.org/2000/01/rdf-schema/>-](http://www.w3.org/2000/01/rdf-schema/>-) "  
"PREFIX owl: <[http://www.w3.org/2002/07/owl/>-](http://www.w3.org/2002/07/owl/>-) "  
"PREFIX dc: <[http://purl.org/dc/terms/>-](http://purl.org/dc/terms/>-) "  
"PREFIX foaf: <[http://xmlns.com/foaf/0.1/>-](http://xmlns.com/foaf/0.1/>-) "  
"PREFIX xsd: <[http://www.w3.org/2001/XMLSchema/>-](http://www.w3.org/2001/XMLSchema/>-) "  
"PREFIX time: <[http://www.w3.org/2006/time/>-](http://www.w3.org/2006/time/>-) "  
"PREFIX geo: <[http://www.w3.org/2003/01/geo/wgs84-pos/>-](http://www.w3.org/2003/01/geo/wgs84-pos/>-) "  
"PREFIX vcard: <[http://www.w3.org/2006/vcard/ns/>-](http://www.w3.org/2006/vcard/ns/>-) "  
"PREFIX osgeo: <[http://rdf.opensahara.com/type/geo/>-](http://rdf.opensahara.com/type/geo/>-) "  
"PREFIX bd: <[http://www.bigdata.com/rdf/search/>-](http://www.bigdata.com/rdf/search/>-) "  
"PREFIX search: <[http://rdf.opensahara.com/search/>-](http://rdf.opensahara.com/search/>-) "  
"PREFIX fn: <[http://www.w3.org/2005/xpath-functions/>-](http://www.w3.org/2005/xpath-functions/>-) "  
"PREFIX gr: <[http://purl.org/goodrelations/v1/>-](http://purl.org/goodrelations/v1/>-) "      
"SELECT ?v ?p ?date ?title ?desc ?modified ?type ?genre  "  
"WHERE {  "  
    "?v a ah:Venue .  "  
    "?p dc:modified ?modified .  "  
    "?e ah:venue ?v .  "  
    "?e ah:production ?p .  "  
    "OPTIONAL {{  "  
        "?p dc:title ?title .  "  
    "}}  "  
    "OPTIONAL {{  "  
        "?p ah:shortDescription ?desc .  "  
    "}}  "  
    "OPTIONAL {{  "  
        "?p ah:productionType ?type .  "  
    "}}  "  
    "OPTIONAL {{  "  
        "?p ah:genre ?genre .  "  
    "}}  "  
    "?v geo:geometry ?geometry .  "  
    "FILTER (search:distance(?geometry, \"POINT(4.890        52.3764)\"^^<[http://rdf.opensahara.com/type/geo/wkt>](http://rdf.opensahara.com/type/geo/wkt>)) < 2000 *  "  "0.00000898315284) .  "  
                            "?e time:hasBeginning ?date .  "  
                            "FILTER (?date >= \"2012-09-06T00:00:00Z\"^^xsd:dateTime) .  "  
                            "FILTER (?date <= \"2012-09-06T23:59:59Z\"^^xsd:dateTime) .  "  
                            "} ORDER BY ?v  "  
                            "LIMIT 100  ";  

with these form fields:

  
   ofxHttpForm form;  
form.action = action_url;  
form.method = OFX_HTTP_POST;  
    form.addFormField("query", query);  
    form.addFormField("output", "json");  
httpUtils.addForm(form);  
  

I get an 200 OK back, but no body. I’ve adapted the query several times, but still no valid return :frowning: