Dear all and Andy, Thanks for the answer. The HTTP encoding should have been considered as you said! Thanks a lot. I ended up with using SPARQLWrapper ( https://rdflib.github.io/sparqlwrapper/) in Python as rdflib.prepareQuery seems to be fixed to rdflib only (not Jena.)
Thanks again. With regards, Jason Koh cseweb.ucsd.edu/~jbkoh On Tue, Sep 6, 2016 at 1:06 AM, Andy Seaborne <[email protected]> wrote: > > > On 06/09/16 00:51, Jason Koh wrote: > >> Hi there, >> >> I am Jason Koh, a PhD student at UCSD studying semantic web. >> >> I am trying to use Jena+Fuseki as it supports REST API directly, but I >> cannot find API documents for it. I was trying to do reverse-engineering, >> but it is too much. *Is there any REST API document of Fuseki?* >> > > See the SPARQL protocol specification and SPARQL Graph Store Protocol. > > Links at the top of: > http://jena.apache.org/documentation/fuseki2/ > > Specific problem I currently face is following (in Python) >> >> 1) Working: requests.post('http://localhost:3030/myproject?query=SELECT >> ?anything WHERE{?anything ?aa ?bb} LIMIT 10') >> >> 2) Not working: requests.post('http://localhost:3030/myproject?query= >> 'prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT >> ?anything >> WHERE{?anything rdf:type ?bb} LIMIT 10'') >> > > This is not a SPARQL problem. > > The URL has a # in it - that's the start of a URL fragment and it is not > part of the URL sent over HTTP. > > The request will end like: > > "...?query=prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns"; > > (space are illegal as well, as are < and > and ?,& have a different > specific meaning) > > You need to encode the query string to include in HTTP. > > See the library your using for how to do this or better use a specific > RDF/SPARQL library. > > For example for Python: rdflib > http://rdflib3.readthedocs.io/en/latest/intro_to_sparql.html > > This returns code 404, >> > > It returns 400 "Bad request", not 404 "Not Found" > > Andy > > and the server says: >> [2016-09-04 14:42:17] Fuseki INFO [12] 400 Parse error: >> prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns >> Encountered " "<" "< "" at line 1, column 13. >> Was expecting: >> <IRIref> ... >> (5 ms) >> >> I cannot help myself to debug this as I put one < for prefix which seems >> to >> be standard in SPARQL. >> >> *Does any of you know how to fix this problem?* (Still I would be very >> happy to have an API doc.) >> >> Thanks for all the open sources and supports. It really helps me. >> >> With regards, >> Jason Koh >> cseweb.ucsd.edu/~jbkoh >> >>
