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Check to see if "Enable HTTP 1.1 for proxy" in enabled. Preferences > Network > Proxy Servers. Opera Turbo and accelerators provided by an ISP use a proxy.
Firefox 23.0, Opera 10.11-4791; Platform: SunOS (OpenIndiana); System: i86pc Opera Desktop Team Security @ Opera Sitepatching blog
Linux in VirtualBox | Opera 12.15-1748
Linux in VirtualBox | Opera 12.15-1748