How can I set response header on express js assets

Question

I need to set CORS to be enabled on scripts served by express  How can I set the headers in these returned responses for public assets

User · Answer

x000D   x000D  service use function req  res  next    x000D      res header  Access-Control-Allow-Origin         x000D      res header  Access-Control-Allow-Methods    GET HEAD OPTIONS POST PUT    x000D      res header  Access-Control-Allow-Headers    Origin  X-Requested-With  Content-Type  Accept  Authorization    x000D      next    x000D        x000D   x000D   x000D

User · Answer

Short Answer   res setHeaders - calls the native Node js method  res set - sets headers  res headers - an alias to res set

User · Answer

This is so annoying   Okay if anyone is still having issues or just doesn t want to add another library  All you have to do is place this middle ware line of code before your routes       Cors Example   app use  req  res  next    gt        res append  Access-Control-Allow-Origin               res append  Access-Control-Allow-Methods    GET PUT POST DELETE        res append  Access-Control-Allow-Headers    Content-Type        next            Express routes app get   api examples    req  res   gt

User · Answer

You can also add a middleware to add CORS headers  something like this would work          Adds CORS headers to the response         link https   en wikipedia org wiki Cross-origin resource sharing       link http   expressjs com en 4x api html res set      param  object  request the Request object     param  object  response the Response object     param  function  next function to continue execution     returns  void      example     lt code gt     const express   require  express       const corsHeaders   require    middleware cors-headers          const app   express       app use corsHeaders       lt  code gt      module exports    request  response  next    gt           http   expressjs com en 4x api html res set     response set            Access-Control-Allow-Origin                 Access-Control-Allow-Methods    DELETE GET PATCH POST PUT            Access-Control-Allow-Headers    Content-Type Authorization                  intercept OPTIONS method     if request method      OPTIONS             response send 200         else           next

User · Answer

There is at least one middleware on npm for handling CORS in Express  cors   see  mscdex answer   This is how to set custom response headers  from the ExpressJS DOC  res set field   value     Set header field to value  res set  Content-Type    text plain      or pass an object to set multiple fields at once   res set      Content-Type    text plain      Content-Length    123      ETag    12345       Aliased as   res header field   value

User · Answer

klode s answer is right   However  you are supposed to set another response header to make your header accessible to others     Example   First  you add  page-size  in response header  response set  page-size   20     Then  all you need to do is expose your header  response set  Access-Control-Expose-Headers    page-size

User · Answer

You can do this by using cors  cors will handle your CORS response  var cors   require  cors    app use cors

User · Answer

There is at least one middleware on npm for handling CORS in Express  cors

[javascript] How can I set response header on express.js assets

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