Cross Origin Requests

[joyciep]

Summary

Allow CORS by adding a way to set the "Access-Control-Allow-Origin" headers

What change needs making?

Something like

argo-server --access-control-allow-origin="http://localhost:8080"

Use Cases

When would you use this?

For making requests from my web application to Argo under the origin of http://localhost:8080 for example.
I can issue a PR for this since this is just setting an HTTP header.

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[alexec]

would you like to submit a PR to add this?

[alexec]

actually, this might be in v3.0?

[joyciep]

would you like to submit a PR to add this?

Submitted a PR for this #4990. Thanks!