https://bugzilla.wikimedia.org/show_bug.cgi?id=57694

       Web browser: ---
            Bug ID: 57694
           Summary: uninformative DoesNotExistError logging
           Product: Parsoid
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Web API
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
    Classification: Unclassified
   Mobile Platform: ---

We are trying to debug a failure with the way parsoid is set up in the
Labs-Vagrant visualeditor role setup
<https://wikitech.wikimedia.org/wiki/Talk:Labs-vagrant#Parsoid_errors_using_VisualEditor_role>

When the client gets 404 errors, the error in /var/log/upstart/parsoid.log is
just 
  ERROR in localhost:Main_Page
  Stack trace: DoesNotExistError: Page Fetch failure for null
  worker 25269 died (1), restarting.

but it doesn't say what the error is.
ebernhardson tweaked the second line to actually say what's going wrong by
adding error to the output, so the second line becomes

  Stack trace: DoesNotExistError: Page Fetch failure for null : Error: Invalid
URI
"undef/w/api.php?format=json&action=query&meta=siteinfo&siprop=namespaces%7Cnamespacealiases%7Cmagicwords%7Cfunctionhooks%7Cextensiontags%7Cgeneral%7Cinterwikimap%7Clanguages%7Cprotocols"

, and now we can get somewhere :)

Two-line patch on its way

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