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"I'm a Mod developer currently working with Forge 1.7.10-1614. Apparently, a week ago, Maven changed their repository address to HTTPS, from HTTP. So, when you build your mod, you get the 'Https required error'. Is there a fix we can apply? Minecraft Forge forums hasn't addressed this issue that I can see."
Minecraft Forge forums no longer support 1.7.10 and have been no help. It looks like the fix is the following (source):