Use proxy with <A HREF="https://f-droid.org/app/cz.martykan.forecastie">Forecastie</A><BR>
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You can download a modified version of forecastie with an option to set server manually in settings. For my server go to settings, select custom server and input "https://trafficpixel.tk". 
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You can download this version <A HREF="forecastie-trafficpixel.apk">here</A> or compile it youself using "git clone github.com/erdmark/forecastie.git" and "gradlew.bat assemble" or "gradle assemble" depending on your environment.
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If your phone is routed you can also change dns with the hosts file:<BR>
Download <A HREF="https://f-droid.org/app/org.adaway">AdAway</A> , Options->Hosts sources->add https://trafficpixel.tk/data/adawayOWM.txt<BR>
apply ad blocking (this sets api.openweathermap.org to point to my server at 185.26.156.39)<BR>

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source code is <A HREF="https://trafficpixel.tk/data/sources/owmproxysources18092017.zip">here</A><BR>
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Questions? admin(@)trafficpixel.tk