Node.js express, timeout "Can\'t set headers after they are sent." -

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I have some strange problems with nodes and express.

One of my tasks that handles the request,

  1. Receive the request
  2. Call DB

    Li>

  3. Process the data and pack it on JSON
  4. response.json (JSON)

    Normally it will be all right but if 2 and 3 Because it is the asynchronous that it will respond automatically and there may be an error after the "Sendable" header is sent. When I call 4

    Is anyone else having this problem? Is there any normal way to handle it or I just need to see what the response is ._The header is completely set? 

      export.appstimebygroup = function (req, res) {var resp = {}; Var ClientID = Webapi.extractClientId (req); AppTime.getByGroupId (clientId, req.body.groupId, function (error, epistem) {if (error) {handleError (error); resp.returnCode = 0; resp.message = "Something has happened, please contact support ; Res.setHeader ("content type", "app / js"); res.json (resp); return;} resp.returnCode = 1; resp.appstime = appstime; if (res._header) {console. log ("Header Everything Set!"); Return;} res.setHeader ("Content Type", "App / JS"); res.json (resp);}); };   
     And there is asynchronous call in AppTime.getByGroupId.   
     
     
     OK  
      form.on ('error', function (Mistake), problem (multipart-form-data-handling timeout).  
     When this happens, {if (options.defer) {err.status = 400; Next (mistake);} done = True;});   
     By default this will res render (400) by default and when the code normally receives the code you want to execute then the problem is.

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