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LuaJIT

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As the standard Lua 5.1 interpreter’s VM is not fully resumable, the methods ngx.location.capture, ngx.location.capture_multi, ngx.redirect, ngx.exec, and ngx.exit cannot be used within the context of a Lua pcall() or xpcall() or even the first line of the for … in … statement when the standard Lua 5.1 interpreter is used and the attempt to yield across metamethod/C-call boundary error will be produced. Please use LuaJIT 2.x, which supports a fully resumable VM, to avoid this.

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