PAC support disabled because there is no system implementation

Question

I\'ve recently upgraded my Nexus 4 to Android 4.4. Whilst debugging my app, I discovered message W/chromium(14962): [WARNING:proxy_service.cc(888)] PAC support disable

Answer 1

I think you can safely ignore this one. It is kinda hard-coded in Chromium Browser Engine.

If you check Chromium sources (https://chromium.googlesource.com/chromium/src.git/+/master/net/proxy/proxy_service.cc) and see ProxyService::CreateUsingSystemProxyResolver you will find

if (!ProxyResolverFactoryForSystem::IsSupported()) {
  LOG(WARNING) << "PAC support disabled because there is no "
                "system implementation";
  return CreateWithoutProxyResolver(proxy_config_service, net_log);
}

where ProxyResolverFactoryForSystem::IsSupported() is just returning false if you're not on Windows or MacOS

class ProxyResolverFactoryForSystem : public ProxyResolverFactory {
  //[...]
  static bool IsSupported() {
#if defined(OS_WIN) || defined(OS_MACOSX)
    return true;
#else
    return false;
#endif
  }
};