Signals Notebook: Gateway timeout error message seen when attempting to export to PDF an experiment

Description: When using the API endpoint GET/entities/{eid}/pdf to export an experiment the error "504 Gateway Time-out" is shown by the application. 

Cause: This error message can be seen when the experiment is too large to be exported using the synchronous API endpoint.

Solution: Use the asynchronous export API endpoint to export the experiment. You can find the steps at the following article: Signals Notebook: How to use the asynchronous PDF export in the API