Troubleshooting CORS Errors on DataHub
Find ready to use proxy to troubleshoot the CORS errors on DataHub
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Find ready to use proxy to troubleshoot the CORS errors on DataHub
Last updated
Was this helpful?
CORS Errors are common when youโre working with APIs but itโs very important to handle them effectively due to several security reasons.
What does it look like?
What it is? - Cross-Origin Resource Sharing () is an -header based mechanism that allows a server to indicate any other (domain, scheme, or port) than its own from which a browser should permit loading of resources. CORS also relies on a mechanism by which browsers make a โpreflightโ request to the server hosting the cross-origin resource, in order to check that the server will permit the actual request. In that preflight, the browser sends headers that indicate the HTTP method and headers that will be used in the actual request.
An example of a cross-origin request: the front-end JavaScript code served from https://domain-a.com
uses to make a request for https://domain-b.com/data.json
.
For security reasons, browsers restrict cross-origin HTTP requests initiated from scripts. For example, XMLHttpRequest
and the follow the . This means that a web application using those APIs can only request resources from the same origin the application was loaded from unless the response from other origins includes the right CORS headers.
How to handle them when working with Figmentโs DataHub?
There are two major ways to handle CORS errors effectively so you donโt expose your API keys and credentials on the Client-Side.
Use a proxy - One solution for making cross-origin requests is to use a CORS proxy to make it seem as though youโre making the request from a location thatโs allowed.
Use a serverless function - Using a serverless function is another more effective way to handle the CORS errors and proxy our requests and here in this we build our own functions or micro-infrastructure to call a web service and interact using APIs. Azure, AWS & GCP are most popular for running serverless functions. Sharing some examples of serverless functions built and shared by our community members.
References -
The CORS mechanism supports secure cross-origin requests and data transfers between browsers and servers. Modern browsers use CORS in APIs such as XMLHttpRequest
or to mitigate the risks of cross-origin HTTP requests. Source -
There are multiple (Must Check) out there that you can use for free. Some of them are
is easy to use โ you simply prepend to your request URL (Not Recommended for Production).
Cloudflare Workers - Doc.
i. Azure Function for CORS proxy by - Check the
ii. AWS Lambda Function for CORS proxy by - Check the
iii. Template if you want to host your own nginx server -
If you have any other solution for the same feel free to share it with us on our . Thanks in advance, we appreciate your contribution.