if one creates a connection, url will be accessed without previously checking its existance, so no meaningfull error message is thrown.

Author: dothebart

pyArango/connection.py

@@ -69,6 +69,8 @@ class Connection(object) :
     def __init__(self, arangoURL = 'http://localhost:8529', username=None, password=None) :
         self.databases = {}
         if arangoURL[-1] == "/" :
+            if ('url' not in vars()):
+                raise Exception("you either need to define `url` or make arangoURL contain an HTTP-Host")
             self.arangoURL = url[:-1]
         else :
             self.arangoURL = arangoURL
@@ -138,4 +140,4 @@ def __getitem__(self, dbName) :
             try :
                 return self.databases[dbName]
             except KeyError :
-                raise KeyError("Can't find any database named : %s" % dbName)
+                raise KeyError("Can't find any database named : %s" % dbName)