fix

@@ -8,6 +8,7 @@
 
 const CaptchaServiceModel = require('../models/captcha-img-service');
 const request = require('request');
+const config = global.yoho.config;
 
 // 对比函数
 const _mustEqualAsync = (req) => {
@@ -55,7 +56,8 @@ const generate = (req, res, next) => {
                     'X-request-ID': req.reqID || '',
                     'X-YOHO-IP': req.yoho.clientIp || '',
                     'X-Forwarded-For': req.yoho.clientIp || '',
-                    'User-Agent': 'yoho/nodejs'
+                    'User-Agent': 'yoho/nodejs',
+                    client_type: config.app
                 }
             }).pipe(res);
         }