删除 content length

index.js

@@ -138,10 +138,9 @@ module.exports = function (options) {
           option.body = ctx.request.rawBody
         }
 
+        delete ctx.request.headers['Content-Length']
         option.headers = Object.assign({}, ctx.request.headers)
-
         delete option.headers['host']
-        delete option.headers['content-length']
 
         debug(option)
         return new Promise(function (resolve, reject) {