代码执行到

ctx.redirect(url)

这行代码的时候 直接保险的错误，都不知道是什么原因？？

·····

TypeError: The header content contains invalid characters

      at validateHeader (_http_outgoing.js:492:11)

      at ServerResponse.setHeader (_http_outgoing.js:496:3)

      at Object.set (/Users/naihe/my-project/ice/node_modules/koa/lib/response.js:440:16)

      at Object.redirect (/Users/naihe/my-project/ice/node_modules/koa/lib/response.js:261:10)

      at Object.proto.(anonymous function) [as redirect] (/Users/naihe/my-project/ice/node_modules/delegates/index.js:40:31)

      at /Users/naihe/my-project/ice/server/controllers/wechat.js:36:7

      at Generator.next (<anonymous>)

      at step (/Users/naihe/my-project/ice/server/controllers/wechat.js:85:191)

      at /Users/naihe/my-project/ice/server/controllers/wechat.js:85:437

      at Promise (<anonymous>)

      at /Users/naihe/my-project/ice/server/controllers/wechat.js:85:99

      at redirect (/Users/naihe/my-project/ice/server/controllers/wechat.js:44:18)

      at dispatch (/Users/naihe/my-project/ice/node_modules/koa-compose/index.js:44:32)

      at next (/Users/naihe/my-project/ice/node_modules/koa-compose/index.js:45:18)

      at /Users/naihe/my-project/ice/node_modules/koa-router/lib/router.js:345:16

      at dispatch (/Users/naihe/my-project/ice/node_modules/koa-compose/index.js:44:32)

      at /Users/naihe/my-project/ice/node_modules/koa-compose/index.js:36:12

      at dispatch (/Users/naihe/my-project/ice/node_modules/koa-router/lib/router.js:350:31)

      at dispatch (/Users/naihe/my-project/ice/node_modules/koa/node_modules/koa-compose/index.js:42:32)

      at /Users/naihe/my-project/ice/node_modules/koa/node_modules/koa-compose/index.js:34:12

      at Server.handleRequest (/Users/naihe/my-project/ice/node_modules/koa/lib/application.js:136:14)

      at emitTwo (events.js:125:13)

      at Server.emit (events.js:213:7)

      at parserOnIncoming (_http_server.js:602:12)

      at HTTPParser.parserOnHeadersComplete (_http_common.js:116:23)

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