Issue with lj2curl implementation

I'm trying to use the resolve API with Lua to log into a REST API interface (Airtable in this case). However when I use the HTTP headers in this line:

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req:setOption(curl.CURLOPT_HTTPHEADER, headerStr)

The code stalls. I've never had that in a Lua script before. If you remove that line the script functions. But the ability to pass an authorisation key etc is lost. The below code sends headers to test website: http://httpbin.org/headers which posts any headers sent to it. Currently it stalls. But sending a CURL command from the command line will work. This implies that there is an issue with Resolves Lua implementation. Anyone have any ideas on how to get around this?

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function testHttpbinHeaders()
    print("Starting testHttpbinHeaders function")

    local sourceURL = "http://httpbin.org/headers"
    print("Constructed sourceURL: " .. sourceURL)

    local ffi = require "ffi"
    local curl = require "lj2curl"
    local ezreq = require "lj2curl.CRLEasyRequest"
    local req = ezreq(sourceURL)
    local body = {}
    req:setOption(curl.CURLOPT_SSL_VERIFYPEER, 0)
    req:setOption(curl.CURLOPT_WRITEFUNCTION, ffi.cast("curl_write_callback",
        function(buffer, size, nitems, userdata)
            table.insert(body, ffi.string(buffer, size * nitems))
            return nitems
        end))

    print("Setting up headers")
    local headerStr = "Test-Header: TestValue"
    req:setOption(curl.CURLOPT_HTTPHEADER, headerStr)

    print("Performing request")
    local ok, err = req:perform()

    print("Request status: " .. tostring(ok))
    print("Error (if any): " .. tostring(err))

    if not ok then
        print("Error performing request: " .. tostring(err))
        return nil
    end

    print("Request performed successfully")
    local responseBody = table.concat(body)
    print("Response body: " .. responseBody)

    return responseBody
end

testHttpbinHeaders()