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question asked: Apr 09 '18, 4:40 a.m.
question was seen: 6,035 times
last updated: Aug 10 '21, 3:43 a.m.

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No 'Access-Control-Allow-Origin' header is present on the requested resource

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Anh Do (27●2●15) | asked Apr 09 '18, 4:40 a.m.

 Hi all,


Currently I am developing an Open Social Gadget to show data from reports of JRS, using javascript, css. when I perform a GET call to load the content from. json file, I get the below message:

"Failed to load https://<<my domain>>:8443/OSGReport/reports/report.json: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://<<ALM domain>>' is therefore not allowed access"

<<my domain>> is my local host server, on my PC, and <<ALM domain>> is the server that host ALM application

Can you please help me on resolving this issue?

Thank you,
Best Regards,
Anh Do

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Donald Nong (14.5k●6●14) | answered Apr 10 '18, 12:14 a.m.

This old post may be helpful to you.
https://jazz.net/forum/questions/208098/cross-domain-request-in-firefox-to-get-dwa-data-into-an-opensocial-gadget-in-rqm

There is also a detailed explanation of CORS for Firefox.
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS

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alexa minar (11) | answered Aug 10 '21, 3:25 a.m.
edited Aug 10 '21, 3:43 a.m. by Ralph Schoon (63.4k●3●36●46)

 Access-Control-Allow-Origin is a CORS (Cross-Origin Resource Sharing) header. The error you get is due to the CORS standard, which sets some restrictions on how JavaScript can perform ajax requests. 


When Site A tries to fetch content from Site B, Site B can send an Access-Control-Allow-Origin response header to tell the browser that the content of this page is accessible to certain origins.  By default, Site B's pages are not accessible to any other origin; using the Access-Control-Allow-Origin header opens a door for cross-origin access by specific requesting origins.

For each resource/page that Site B wants to make accessible to Site A, Site B should serve its pages with the response header:

Access-Control-Allow-Origin: http://siteA.com


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