Int cannot parse the given literal of type

[Kubilay Kocabal]

Hi everybody, I am having trouble sending url parameter to graphql. 

Basicly I want to do take my serviceNo from my url and send it to graphql in query

My code is :

{
"endpoint": "/gw/graphql/{serviceNo}",
"input_query_strings": ["*"],
"method": "GET",
"output_encoding": "json",
"backend": [
{
"host": [
"<my_host>"
],
"url_pattern": "/my_url",
"encoding": "json",
"method": "GET",
"extra_config": {
"backend/graphql": {
"type": "query",
"query": "query Service($sNo: Int) {\n service(\n where: {mainServiceNo: {eq: $sNo}}\n ) {\n items {\n serialNo\n }\n }\n}",
"variables": {
"sNo": "{serviceNo}"
}
},
"backend/http": {
"return_error_details": "backend_alias"
}
}
}
]
}

and I am getting this response from server:

{

    "error_backend_alias": {

        "http_status_code": 500,

        "http_body":"{\"errors\":[{\"message\":\"Int cannot parse the given literal of type \`StringValueNode\`.\",\"path\":[\"sNo\"]}]}"

    }

}

I have to send this parameter int , but in variables area it converts string I think,

I could not figure this out.

Can anybody help me please ?

Thank you.

Regards,