Access Unity Cloud Build API through WebGL build

Unity Services
1

Hello,

I’m working on a small app that accesses Unity Cloud Build’s API to access information about our organization’s applications. This works in the Editor but when I attempt to run it as a WebGL project (either through Unity Cloud Build’s play functionality or hosted on our own servers), it is not able to access the API - I get this response:

Access to XMLHttpRequest at ‘[API URL]’ from origin ‘[MY SERVER URL]’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: The ‘Access-Control-Allow-Origin’ header has a value ‘https://build.cloud.unity3d.com’ that is not equal to the supplied origin.

Checking the response headers for the CORS preflight OPTION request in a browser, shows the “access-control-allow-origin” header with a value of “https://build.cloud.unity3d.com”. When done through Postman, I get a value of “*” (wildcard) which from what I’ve read indicates it should work from any domain.

Should it be doable to access Unity’s Cloud Build API through a WebGL build? Is there something that I’m missing that would allow this to work? Or is the issue on Unity’s server side?

Thanks!

2

I’ve managed to get the URL to work by passing the URL into a CORS proxy (see this StackOverflow answer) to get around the issue but I feel like this isn’t really a good solution.

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