Need to convert queryParam to header when reaching backend

[Swaroop]

Hi All,
Can anyone help me in acheiving the conversion of queryParam from input to header when reaching backend url.
I have tried with lua script below in green highlighted colour,but still they are going as queryParams

{
    "endpoint": "/api/cat",
    "output_encoding": "no-op",
    "method": "GET",
    "input_query_strings": [
        "*"
    ],
    "input_headers": [
        "User-Agent",
        "Accept",
        "X-Access-Token",
        "Host",
        "X-Tenant-Id",
        "x-start-record",
        "x-batch-size"
    ],
    "extra_config": {
        "modifier/lua-endpoint": {
            "allow_open_libs": true,
           "pre": "local c = ctx.load(); c:headers('x-access-token', string.sub(c:headers('Authorization'),8)); c:headers('x-tenant-id', c:headers('spid')); c:headers('x-start-record', c:query('x-start-record')); c:headers('x-batch-size', c:query('x-batch-size'));"
        }
    },
    "backend": [{
            "encoding": "safejson",
            "method": "GET",
            "sd": "static",
            "url_pattern": "/catlogue",
            "host": [
                "{{ env "HOST" }}"
            ]
        }
    ]
}


Thanks

Regards,
Santhiswaroop Chenchu

[Swaroop]

Hi All,
Just to be clear i tried to take 'x-start-record' and 'x-batch-size' from input queryParam and wanted to convert into header at backend by lua middleware but not successful though. Any insights can be helpful and appreciated.

Thanks

Regards,
Santhiswaroop Chenchu