diff --git a/indexapi_v2.py b/indexapi_v2.py
index beed861..ee41aaa 100644
--- a/indexapi_v2.py
+++ b/indexapi_v2.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
-# Copyright (c) 2023, Silvio Peroni <essepuntato@gmail.com>, Ivan Heibi <ivan.heibi2@unibo.it>
+# Copyright (c) 2023, Silvio Peroni <essepuntato@gmail.com>
 #
 # Permission to use, copy, modify, and/or distribute this software for any purpose
 # with or without fee is hereby granted, provided that the above copyright notice
@@ -134,6 +134,7 @@ def __call_tp_for_citations(omid_l):
     } GROUP BY ?cited
     """
     try:
+        headers={"Accept": "application/sparql-results+json", "Content-Type": "application/sparql-query"}
         response = post(sparql_endpoint, headers=headers, data=sparql_query, timeout=45)
         if response.status_code == 200:
             r = loads(response.text)
diff --git a/meta_v1.hf b/meta_v1.hf
index 362022c..d2bb234 100644
--- a/meta_v1.hf
+++ b/meta_v1.hf
@@ -6,7 +6,7 @@
 #version Version 1.1.1 (2022-12-22)
 #contacts [contact@opencitations.net](mailto:contact@opencitations.net)
 #license This document is licensed with a [Creative Commons Attribution 4.0 International License](https://creativecommons.org/licenses/by/4.0/legalcode), while the REST API itself has been created using [RAMOSE](https://github.com/opencitations/ramose), the *Restful API Manager Over SPARQL Endpoints* created by [Silvio Peroni](https://orcid.org/0000-0003-0530-4305), which is licensed with an [ISC license](https://opensource.org/licenses/ISC).
-#endpoint http://127.0.0.1/meta/sparql
+#endpoint http://127.0.0.1:8990/sparql
 #method post
 #addon metaapi
 
@@ -214,9 +214,9 @@ WHERE {
                 ?res frbr:partOf+ ?resVolume.
                 ?resVolume a fabio:JournalVolume;
                             fabio:hasSequenceIdentifier ?volume.
-            }   
+            }
         } GROUP BY ?res ?title ?author_ ?editor_ ?publisher_ ?type ?issue ?volume ?pub_date ?page  ?venueName ?venueMetaid ORDER BY DESC(?totAuthor) DESC(?totEditor) DESC(?totPublisher)
-    } 
+    }
     BIND(CONCAT(?ids, IF(STR(?ids) != "", " ", ""), "omid:br/", STRAFTER(STR(?res), "/br/")) AS ?id)
     BIND(IF(STR(?venue_ids) != "", CONCAT(" [", ?venue_ids, " ", ?venueMetaid, "]"), "") AS ?venueIdentifiers)
     BIND(CONCAT(?venueName, ?venueIdentifiers) AS ?venue)
@@ -458,9 +458,9 @@ WHERE {
                 ?res frbr:partOf+ ?resVolume.
                 ?resVolume a fabio:JournalVolume;
                             fabio:hasSequenceIdentifier ?volume.
-            }   
+            }
         } GROUP BY ?res ?title ?author_ ?editor_ ?publisher_ ?type ?issue ?volume ?pub_date ?page  ?venueName ?venueMetaid ORDER BY DESC(?totAuthor) DESC(?totEditor) DESC(?totPublisher)
-    } 
+    }
     BIND(CONCAT(?ids, IF(STR(?ids) != "", " ", ""), "omid:br/", STRAFTER(STR(?res), "/br/")) AS ?id)
     BIND(IF(STR(?venue_ids) != "", CONCAT(" [", ?venue_ids, " ", ?venueMetaid, "]"), "") AS ?venueIdentifiers)
     BIND(CONCAT(?venueName, ?venueIdentifiers) AS ?venue)
@@ -676,10 +676,10 @@ WHERE {
                 ?res frbr:partOf+ ?resVolume.
                 ?resVolume a fabio:JournalVolume;
                             fabio:hasSequenceIdentifier ?volume.
-            }   
+            }
         } GROUP BY ?res ?title ?author_ ?editor_ ?publisher_ ?type ?issue ?volume ?pub_date ?page  ?venueName ?venueMetaid ORDER BY DESC(?totAuthor) DESC(?totEditor) DESC(?totPublisher)
-    } 
+    }
     BIND(CONCAT(?ids, IF(STR(?ids) != "", " ", ""), "omid:br/", STRAFTER(STR(?res), "/br/")) AS ?id)
     BIND(IF(STR(?venue_ids) != "", CONCAT(" [", ?venue_ids, " ", ?venueMetaid, "]"), "") AS ?venueIdentifiers)
     BIND(CONCAT(?venueName, ?venueIdentifiers) AS ?venue)
-} GROUP BY ?id ?title ?type ?issue ?volume ?venue ?pub_date ?page
\ No newline at end of file
+} GROUP BY ?id ?title ?type ?issue ?volume ?venue ?pub_date ?page