@Philip.Afortadera So the only way to use the Eikon Data API via Eikon web would be via Codebook App - which is our hosted scripting environment. To use the API outside of Codebook would require the standalone Desktop app as all requests go via a proxy which is only available there. I hope this can help.
Please be informed that the Codebook app is supported on the Eikon/Workspace web version as well. You can find more detail on this Use Eikon Data API or RDP Library in Python in CodeBook on Web Browser article.