Dairi is a web service (that you take care of) that acts as a CORS-bypass proxy thingie for Oshi web app.
It allows the app to make cross-origin requests without being blocked by the browser's same-origin policy.
To set up Dairi with render.com, follow these steps:
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Sign up for an account on render.com if you haven't already
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Create a new web service on render.com and choose 'Public Git Repository'
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Paste Dairi's link under the 'Public Git Repository' field
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Set upp all properties as shown in the image below, and choose your own service name
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Select the 'Free' tier for 750h of uptime each month, which is just about enough for us (31.25 days)
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Click 'Deploy Web Service' and grab the URL of the service once it's deployed
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In the Oshi web app, paste the proxy endpoint address to use your new service
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Do some testing to ensure that you can now make cross-origin requests