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Several people have observed that LrHTTP doesn't provide flexibility in overriding headers. See this thread for a similar discussion and possible workarounds:
so the only option is to go with luasocket or luacurl for example.
I'm not sure how you're thinking of using LuaSocket or LuaCURL. They are modules that need to be dynamically loaded into the application hosting Lua, which in this case is Lightroom. But LR doesn't allow for dynamic loading of Lua modules.