Problems when enabling CORS!!

[michael.hi...@gmail.com]

I'm using node js and my application runs on port 3000 and DCM4CHEE with the WADO service runs on port 8080 and at the time of running cornerstone the browser shows this error

XMLHttpRequest can not load http: // localhost: 8080 / wado? RequestType = WADO & studyUID = 1.2.840.113704.1.111.5 ... 26513.429 & contentType = application% 2Fdicom & transferSyntax = 1.2.840.10008.1.2. In 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http: // localhost: 3000' is therefore not allowed acces

But I tried to enable the cors in NODEJS but it does not work me install mendiate npm cors but still does not work also use the proxy of cors-anywhere.herokuapp.com

And I keep the code this

If (series.numberOfFrames! == undefined) {

  Var numberOfFrames = series.numberOfFrames;

  For (var i = 0; i <numberOfFrames; i ++) {

  Var imageId = series.instanceList [0] .imageId + "? Frame =" + i;

  If (imageId.substr (0, 4)! == 'http') {

  ImageId = "dicomweb: https: //cors-anywhere.herokuapp.com/http: // localhost: 8080 /" + imageId;

  }

  Stack.imageIds.push (imageId);

  }

Or I have to enable the CORS from DCM4CHEE and if that's how it is done, please I need help

[Leonardo Campos]

Have you tried using a reverse proxy?

Nginx is a good one. (Orthanc example)

It's easy to set up and very light and fast.

----

I suppose cors-anywhere is not working because you're passing localhost as host but it will always be resolved to 127.0.0.1 and the cors-anywhere will not be able to reach your node server. You should use a valid host name (try using a DDNS) or IP address. The IP address can't be any private IP address (127.0.0.1, 192.168.*.*, 172.16.*.* or 10.*.*.*).

----

If you're using nodejs you can also take a look at this code:
https://github.com/OHIF/Viewers/tree/master/Packages/ohif-wadoproxy/server

OHIF doesn't send requests directly to DICOM servers. It sends the request to its wado proxy that's under the same domain.

OHIF (browser) <-> OHIF (server, wado proxy) <-> Orthanc / DCM4CHEE / etc

If you go to http://viewer.ohif.org/ and open Chrome Dev Tools you'll see requests like this:

http://73.167.149.252:3030//__wado_proxy?url=http%3A%2F%2Froblewis.net%3A8042%2Fwado%3FrequestType%3DWADO%26studyUID%3D1.3.6.1.4.1.25403.345050736522.5748.20160321115121.7%26seriesUID%3D1.3.6.1.4.1.25403.345050736522.5748.20160321115121.8%26objectUID%3D1.3.6.1.4.1.25403.345050736522.5748.20160321115122.11%26contentType%3Dapplication%252Fdicom&options=%7B%22auth%22%3A%22orthanc%3Aorthanc%22%2C%22logRequests%22%3Atrue%2C%22logResponses%22%3Afalse%2C%22logTiming%22%3Atrue%7D
The main url is different but you'll not get any error message because OHIF is loaded in a frame with same url (http://73.167.149.252:3030/). The wado proxy will decode the url, send the request to a DICOM server, get the response and send it to the client.

I hope this help you.

Regards,

Leonardo Campos

Minas Gerais, Brazil

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[michael.hi...@gmail.com]

To this Nginx you mean?

Https://carlosazaustre.es/blog/como-configurar-nginx-con-node-js-en-produccion/

Try to use reverse proxy but I could not, you can explain more

This is what the browser shows me

The server responds with the following;

HEADER RESPONSE

Content-Type: application / dicom

Date: Sat, 01 Apr 2017 01:15:38 GMT

Expires: 0

Server: Apache-Coyote / 1.1

Transfer-Encoding: chunked

X-Powered-By: Servlet 2.4; JBoss-4.2.3.GA (build: SVNTag = JBoss_4_2_3_GA

Date = 200807181439) /JBossWeb-2.0

REQUEST HEADER

Accept: * / *

Accept-Encoding: gzip, deflate, sdch, br

Accept-Language: en-US, en, q = 0.8, en-US; q = 0.6, en; q = 0.4

Connection: keep-alive

Host: localhost: 8080

Origin: http: // localhost: 3000

Referer: http: // localhost: 3000 /

User-Agent: Mozilla / 5.0 (X11; Linux x86_64) AppleWebKit / 537.36 (KHTML, like

Gecko) Chrome / 55.0.2883.87 Safari / 537.36

Also try using api proxy https://cors-anywhere.herokuapp.com/

But it does not work

These are my app.js code

Var express = require ('express');

Var cors = require ('cors')

Var users = require ('./ routes / users');

Var app = express ();

App.use (cors ({origin: 'localhost: 8080';}));

App.set ('views', path.join (__ dirname, 'views'));

App.use ('/', index); App.use ('/ users', users); App.listen (3000, function () {}); Module.exports = app

Can you explain me more

Also try to enter the page http://viewer.ohif.org/ but this fall; Can you explain me more how to use a reverse proxy in NODEJS because I try to use one and I could not

I also saw this example

Var http = require ('http'),

    HttpProxy = require ('http-proxy');

Var proxy = httpProxy.createProxyServer ({target: 'http: // localhost: 8042'}) .listen (8000);

Proxy.on ('proxyRes', function (proxyReq, req, res, options) {

  // add the CORS header to the response

  Res.setHeader ('Access-Control-Allow-Origin', '*');

});

Proxy.on ('error', function (e) {

  // suppress errors

});

But I did not work because I use express.