https://bugzilla.wikimedia.org/show_bug.cgi?id=35300
Web browser: ---
Bug #: 35300
Summary: API returns invalid JSON despite HTTP status 200
Product: MediaWiki
Version: 1.19
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: API
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Classification: Unclassified
Mobile Platform: ---
Since a while I enabled a semi-automated reporting of a very heavily used
script on WikimediCommons.
The user has the possibility to press a button to post the error message to a
list of those.
Now, after about 1 month there are 4 reported (this means that this occurs much
more often) errors:
API request returned code 200 parsererror. Error code is SyntaxError:
JSON.parse: Parsed string contains more than single value: <!DOCTY...
or
API request returned code 200 parsererror. Error code is SyntaxError:
JSON.parse: unexpected non-whitespace character after JSON data
This means that jQuery received a 200 response and tried to build a JS-object
for the presumed json-string and that failed.
Since we are using "secure techniques" (js objects) to build the query string,
and the format-parameter is always set to json by a wrapper-method (all
requests are handled by doAPICall), this problem only occurs when editing, I
think the problem is at the server side.
If you would like to be up-to-date with those issues, just watch
https://secure.wikimedia.org/wikipedia/commons/wiki/MediaWiki_talk:AjaxQuickDelete.js/auto-errors
for new entries with "API request returned code" (I could make a separate page
for server errors, if you want or send them with JSONP to a
health-status-server.
It's a page you can learn a lot from: E.g. "API request failed (hookaborted):
The modification you tried to make was aborted by an extension hook" is a very
bad error-message. User has to guess which hook of the the thousands.)
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