1. 回音反参

接口实现：Python+API网关 接口功能：获取客户端自己发送到服务器端的参数，目前仅仅支持IP（受限于API网关的系统参数）

POST:http://api.xdua.com/echo

服务器端返回的字段如下：

{
    "result":             
    {
        "httpschema":"HTTP",
        "proxy":"AliCloudAPIGateway",
        "domain":"d5655fd0807547189939a22f6c99bee1-cn-beijing.alicloudapi.com",
        "ip":"111.196.69.239",
        "ua":"Apache-HttpClient/4.1.2 (java 1.6)",
    },
    "error":0,
    "reason":"Success"
}

返回数据

成功返回

{
    "error": 0,
    "reason": "success"
    "result": {"ip":"发送者ip","ua":"发送者useragent"},
}

失败返回

{
    "error": 1,
    "reason": "失败的时候是具体原因"
    "result": {},
}