[Mediawiki-api] [Mediawiki-api-announce] BREAKING CHANGE: HTTP 503 status code for maxlag errors

[Roan Kattouw]

My apologies for sending out this e-mail so late.

As of r52190 [1], API maxlag errors (the kind of error you get when
you set &maxlag=2 and the maximum slave lag is higher than two
seconds) return a HTTP 503 status code rather than a 200, for
consistency with index.php (which does the same thing). The text of
the response has not changed:

<api>
  <error code="maxlag" info="Waiting for 10.0.6.38: 1 seconds lagged" />
</api>

To trigger a maxlag error, you can set &maxlag=-1 [2].

Be aware that some client libraries may treat the 503 return code
differently, which is why this could be a breaking change.

Roan Kattouw (Catrope)

[1] http://www.mediawiki.org/wiki/Special:Code/MediaWiki/52190
[2] http://en.wikipedia.org/w/api.php?maxlag=-1&action=query

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