SPARQL query using HTTP GET¶

For HTTP endpoints providing HTTP GET SPARQL protocol, we may send SPARQL queries as follows:

Having a query:

SELECT ?p
WHERE {?p ?s ?o}
LIMIT 2

one can send it to the SPARQL enabled endpoint https://lod.tamtamresearch.com/sparql using HTTP GET with the query being urlencoded in query query parameter:

GET /sparql?query=SELECT+%3Fp%0AWHERE+%7B%3Fp+%3Fs+%3Fo%7D%0ALIMIT+2&format=turtle HTTP/1.1
Host: lod.tamtamresearch.com

what could return result:

@prefix res: <http://www.w3.org/2005/sparql-results#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
_:_ a res:ResultSet .
_:_ res:resultVariable "p" .
@prefix xsd:    <http://www.w3.org/2001/XMLSchema#> .
_:_ res:solution [
      res:binding [ res:variable "p" ; res:value xsd:ID ] ] .
_:_ res:solution [
      res:binding [ res:variable "p" ; res:value xsd:date ] ] .

The format can be alternatively request by means of Accept header, e.g.:

GET /sparql?query=SELECT+%3Fp%0AWHERE+%7B%3Fp+%3Fs+%3Fo%7D%0ALIMIT+2 HTTP/1.1
Accept: text/turtle
Host: lod.tamtamresearch.com

SPARQL query using HTTP POST¶

Query text can be also sent in HTTP POST request body.

For query

SELECT ?p
WHERE {?p ?s ?o}
LIMIT 2

The HTTP request would be:

POST /sparql?format=text%2Fturtle HTTP/1.1
Content-Length: 35
Host: lod.tamtamresearch.com

SELECT ?p
WHERE {?p ?s ?o}
LIMIT 2

Similarly as with HTTP GET we may use header Accept to ask for specific result format:

POST /sparql HTTP/1.1
Accept: text/turtle
Content-Length: 35
Host: lod.tamtamresearch.com

SELECT ?p
WHERE {?p ?s ?o}
LIMIT 2

Supported output formats¶

Following values for format or Accept are supported:

• text/turtle

• application/rdf+xml

• application/sparql-results+json

• application/sparql-results+xml

• text/csv

• text/html

• text/plain

• text/tab-separated-values