//post 表单中常见的四种表单请求方式
typedef enum {
postformURLEncoded, /*对应Content-Type: application/x-www-form-urlencoded;*/
postformMultipartData, /*对应Content-Type: multipart/form-data; boundary=----*/
postformJson, /*对应Content-Type: application/json;
当然也可以使用application/x-www-form-urlencoded;*/
postformXML /*对应Content-Type: text/xml;*/
}PostFormDataType;