how can I get raw body string in Lambda (API gateway Lambda proxy)

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After enabled CORS on API gateway, here is the request I sent to the http end point:

    $.ajax({
        type: 'put',
        url: 'http://ift.tt/2lG925n',
        data: {params: {param1: "543543", param2: "fdasghdfghdf", test: "yes"}},
        success: function(msg){
            console.log(msg);
        },
        error: function(msg){
            console.log(msg);
        }
    });

Here is the lambda function(I'm using node serverless package, and no mistakes on the code):

module.exports.julian_test = (event, context, callback) => {
    console.log(event);
    console.log(event.body);

var response_success = {
    statusCode: 200,
    headers: {
        "Access-Control-Allow-Origin": "*"
    },
    body: JSON.stringify({
        firstUser: {
            username: "Julian",
            email: "awesome"
        },
        secondUser: {
            username: "Victor",
            email: "hello world"
        },
        thirdUser: {
            username: "Peter",
            email: "nice"
        }
    })
};
    callback(null, response_success);
};

The console.log(event.body) logs out : params%5Bparam1%5D=543543&params%5Bparam2%5D=fdasghdfghdf&params%5Btest%5D=yes

, which is not the format I want. I checked the OPTIONS Integration Request / body mapping template, here is the snapshot.

I tried to delete the "application/json" but after that I receive the following response:

XMLHttpRequest cannot load http://ift.tt/2lG9rVi. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. The response had HTTP status code 500.

Does anyone know how to get a raw string request body in the back-end lambda? Please help!

asked 2 mins ago

Pano

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how can I get raw body string in Lambda (API gateway Lambda proxy)