I've noticed an odd discrepancy in service responses between local and the Beta Cluster on the one hand, and production on the other: the http: scheme is being prepended or, apparently in some cases, rewritten from https.
Two examples:
From /page/mobile-sections-lead/Barack_Obama:
Beta Cluster/Local (expected):
"image": { "file": "President_Barack_Obama.jpg", "urls": { "320": "//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/320px-President_Barack_Obama.jpg", "640": "//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/640px-President_Barack_Obama.jpg", "800": "//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/800px-President_Barack_Obama.jpg", "1024": "//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/820px-President_Barack_Obama.jpg" } },
Prod (unexpected):
"image": { "file": "President_Barack_Obama.jpg", "urls": { "320": "http://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/320px-President_Barack_Obama.jpg", "640": "http://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/640px-President_Barack_Obama.jpg", "800": "http://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/800px-President_Barack_Obama.jpg", "1024": "http://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/820px-President_Barack_Obama.jpg" } },
From /page/summary/Barack_Obama:
Beta Cluster/Local (expected):
"thumbnail": { "source": "https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/256px-President_Barack_Obama.jpg", "width": 256, "height": 320, "original": "https://upload.wikimedia.org/wikipedia/commons/8/8d/President_Barack_Obama.jpg" },
Prod (unexpected):
"thumbnail": { "source": "https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/256px-President_Barack_Obama.jpg", "width": 256, "height": 320, "original": "http://upload.wikimedia.org/wikipedia/commons/8/8d/President_Barack_Obama.jpg" },