错误一：

代码如下——

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app.get('/connect', function(req, res){
    payload = {"client_id" : config.Client_ID, 
               "client_secret" : config.Client_Secret, 
               "refresh_token" : 'https://localhost/connect', 
               "speech": "lalallalalalala"
    }
    url = "https://api.amazon.com/auth/o2/token/?grant_type=refresh_token&client_id=" + config.Client_ID +
    "&client_secret=" + config.Client_Secret;
    request.post({
            url:url, 
            headers: {
            },
            formData: payload
    }, function optionalCallback(err, httpResponse, body) {
    if (err) {
        return console.error('upload failed:', err);
    }
        res.end(body);
    });
});

报错"error_description":"The request is missing a required parameter : Content-Type","error":"invalid_request"

**解决方案:**在headers　里添加——

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headers: {
         " Accept": "application/x-www-form-urlencoded",
         "Content-Type":"application/x-www-form-urlencoded",
},

错误二:

报错如下——
"error_description":"Malformed request","error":"invalid_request"

解决方案，使用request中request.post 函数体内请求url错误，更改如下即可：

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url = "https://api.amazon.com/auth/o2/token/?grant_type=refresh_token&client_id=" + config.Client_ID +
"&client_secret=" + config.Client_Secret;