WebAPI of '/blockChain/rawTransaction' got error

[Wangmmx]

When I use the interface, it keeps reporting errors. What are the specific parameters of this interface?

Here is the code:

var tx = {
From: '..',
To: '..',
...
}
var options = {
    method: 'POST',
    url: 'http://54.199.254.157:8000/api/blockChain/rawTransaction',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify(tx)
};
request(options, function (error, response) {
    if (error) throw new Error(error);
    console.log(response.body);
});

And the error is
{"Error":{"Code":"20012","Message":"Invalid params","Details":null,"ValidationErrors":null}}