With T144023 we introduced using 'retry-after' value from http response_headers. But it seems this parameter is missing. I get those keys only:
```
['Content-Length',
'Via',
'Vary',
'X-Cache-Status',
'X-Cache',
'X-Content-Type-Options',
'Content-Encoding',
'Cache-control',
'Backend-Timing',
'X-Varnish',
'Content-Disposition',
'Accept-Ranges',
'Date',
'X-Client-IP',
'X-Analytics',
'X-Powered-By',
'Age',
'Strict-Transport-Security',
'Server',
'Server-Timing',
'Connection',
'X-Frame-Options',
'Content-Type']
```
This defaults the wait time for to 5 seconds which might be to short,
see https://api.travis-ci.org/v3/job/458291459/log.txt for example (T210322)
See also https://www.mediawiki.org/w/index.php?title=Manual:Maxlag_parameter&oldid=85948
but is this value submitted? Refer T172293 for this