Cross-domain request in Firefox to get DWA data into an OpenSocial gadget in RQM

Question

I am developing an OpenSocial gadget (JavaScript language) for RQM (Rational Quality Manager) that gets information from DWA (Doors Web Access). The gadget is running on RQM (https://:9443/) and I want to make request to the DWA (https://:8443/).

The gadget runs correctly in IE, but when I run in Firefox I get the following error:

> Cross-Origin Request Blocked: The Same Origin Policy disallows reading
> the remote resource at https://<host>:8443/xxxx. (Reason: CORS header
> 'Access-Control-Allow-Origin' missing). <unknown> Cross-Origin Request
> Blocked: The Same Origin Policy disallows reading the remote resource
> at https://<host>:8443/xxxx. (Reason: CORS request failed). <unknown>

What could be the issue and what can I do? Is there anything I can do on the client side? Is DWA compatible with CORS (Cross-origin resource sharing)?

Thanks in advance!

Answer 1

0

permanent link

Donald Nong (14.5k●6●14) | answered Oct 02 '15, 1:59 a.m.

This is explained in details in the below article (also on why IE works)
https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy

If you are using Tomcat and would like to configure CORS, check out the answer in this post.
https://jazz.net/forum/questions/151485/does-rtc-support-cors-cross-origin-resource-needed-for-a-javascript-oslc-consumer

Comments

Leire Torres commented Oct 08 '15, 4:43 a.m. | edited Oct 11 '15, 7:36 p.m.

Thanks for the answer Donald.

I tried the steps you mention in the other post but I can´t achieve what I want.

The Tomcat version the CLM uses is 7.0.54, so I skip the first 3 steps and I started adding a new filter to the Tomcat configuration as described in the document; adding to the JTS/conf/web.xml file the next lines:

<filter-name>CorsFilter</filter-name>

<filter-class>org.apache.catalina.filters.CorsFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>CorsFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

But when I execute the OpenSocial gadget from Firefox, still the following error appears:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://<host>:<port>/jts/rootservices. (Reason: CORS header 'Access-Control-Allow-Origin' missing).

The request I made from Javascript is:

var rootServices = new XMLHttpRequest();

rootServices.onreadystatechange = function()

{

if (rootServices.readyState == 4 && rootServices.status == 200)

{

//do something

}

}

rootServices.open('GET', 'https://<host>:<port>/jts/rootservices', true);

rootServices.send(null);

What could be the issue and what can I do?

Thanks in advance!

Leire Torres commented Oct 09 '15, 4:02 a.m. | edited Oct 09 '15, 4:03 a.m.

Thanks for the answer Donald.

I tried the steps you mention but still the same error appears.

Donald Nong commented Oct 11 '15, 7:43 p.m.

Have you checked the request/response headers? To make this work, you should have the response "Access-Control-Allow-Origin" header match the request "Origin" header.

Leire Torres commented Oct 14 '15, 5:23 a.m. | edited Oct 14 '15, 5:24 a.m.

Yes, I checked them with Advanced Rest Client Chrome extension and this is what I get:

Request headers:

User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36

Content-Type: text/plain; charset=utf-8

Accept: /

Accept-Encoding: gzip, deflate, sdch

Accept-Language: en,es;q=0.8

Origin: http://evil.com/

Response headers:

Server: Apache-Coyote/1.1

Cache-Control: public

Expires: Wed, 14 Oct 2015 09:06:45 GMT

Access-Control-Allow-Credentials: true

ETag: "9LhLIw5Owb9ITNgK1rxnokORP90="

Date: Wed, 14 Oct 2015 09:01:45 GMT

Content-Type: application/rdf+xml;charset=UTF-8

Transfer-Encoding: chunked

Access-Control-Allow-Origin: *

Access-Control-Allow-Headers: x-goog-authuser, authorization, content-type

Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE

Allow: POST, GET, OPTIONS, PUT, DELETE

Leire Torres commented Oct 14 '15, 6:47 a.m. | edited Oct 14 '15, 7:09 a.m.

Sorry dnong, but I have just realized that I see these response headers only when Allow-Control-Allow-Origin: * Chrome extension is enabled.

Is there something equivalent for Firefox? Or how can I avoid using these extensions?

Donald Nong commented Nov 03 '15, 11:41 p.m.

Have you been able to do this? IIRC, the "Access-Control-Allow-Origin" response header is returned by Tomcat (or whatever the application server), so using a Chrome extension is just a "hack". There should be no need for any extra settings on the client side.

Leire Torres commented Jan 12 '16, 3:21 a.m.

Yes, finally I got it. The request I made from Javascript was wrong.

Thank you for all your assistance.

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