node.jsでNeo4jへのPOSTリクエストを介して正しいCypherクエリを作成するには?
コード:
var http = require('http');
var options = {
host: 'a90cfa68c.hosted.neo4j.org',
port: 7357,
path: '/db/data/cypher',
method: 'POST',
headers: {
'Authorization': 'Basic ' + new Buffer("<login>:<password>").toString('base64')
},
"Content-Type" : "application/json",
"query" : "START root=node(*) RETURN root" // <--- Doesn't work :(
};
http.request(options, function(res) {
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log('BODY: ' + chunk);
});
}).end();
結果:
STATUS: 400
HEADERS: {"content-length":"340","content-encoding":"UTF-8","content-type":"application/json","access-control-allow-origin":"*","server":"Jetty(6.1.25)"}
BODY: {
"message" : "You have to provide the 'query' parameter.",
"exception" : "BadInputException",
"stacktrace" : [ "org.neo4j.server.rest.web.CypherService.cypher(CypherService.java:63)", "java.lang.reflect.Method.invoke(Method.java:597)", "org.neo4j.server.extension.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:57)" ]
}
期待される結果: すべてのノードのリスト ( Neo4j コンソール
と同じ)POST /db/data/cypher {"query":"START root=node(*) RETURN root"}
解決策(Andrew Palumbo に感謝):
// Changes goes here:
var req = http.request(options, function(res) {
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log('BODY: ' + chunk);
});
});
// Writing into body:
req.write('{"query":"START root=node(*) RETURN root"}');
req.end();