Qonsole: issue with error reporting.

[der]

In production attempting a long running query via the Sparql form, such as:

PREFIX  ppi:  <http://landregistry.data.gov.uk/def/ppi/>
PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>
PREFIX  rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX  common: <http://landregistry.data.gov.uk/def/common/>

SELECT  (COUNT(?transaction) AS ?count) (SUM(?price) AS ?total) ?area ?type
WHERE
{ { SELECT DISTINCT  ?propertyAddress
            WHERE
              { ?propertyAddress
                          <http://jena.apache.org/text#query>  ( "town: bristol" 3000000 )
              }
          }
    ?transaction  ppi:propertyAddress  ?propertyAddress .
    ?transaction  ppi:pricePaid     ?price ;
              ppi:propertyType      ?pt ;
              ppi:transactionDate   ?date ;
              ppi:transactionCategory  ?category .
    ?propertyAddress common:district ?area .
    ?pt  rdfs:label  ?type .
  }
GROUP BY ?area ?type
ORDER BY ?area ?type

results in a timeout after 1 min with the the error message Sorry, that didn't work because: 'GATEWAY_TIMEOUT'

In hmlr-dev the same test results in embedded error page.

The underlying cause may well be due to some change in how the backend is responding, rather than a regression with qonsole.

[jonrandahl]

Shelving this for the time being as it looks like we've got more dependency issues with this package as a whole and will need more time to investigate the best way forward:

An error occurred while installing mimemagic (0.3.10), and Bundler cannot continue.

In Gemfile:
  qonsole-rails was resolved to 0.6.2, which depends on
    rails was resolved to 5.2.4.3, which depends on
      activestorage was resolved to 5.2.4.3, which depends on
        marcel was resolved to 0.3.3, which depends on
          mimemagic

Which was an attempt to resolve the locked version of mimemagic which no longer exists:

Your bundle is locked to mimemagic (0.3.5) from rubygems repository https://rubygems.org/ or 
installed locally, but that version can no longer be found in that source. That means the author 
of mimemagic (0.3.5) has removed it. You'll need to update your bundle to a version other than 
mimemagic (0.3.5) that hasn't been removed in order to install.

[der]

This one remains and issue is potentially blocker to release since it's a visible regression from current production.