Download Dataset does not work when not logged in

[yairwein]

Issue Summary

Using a query public URL, trying to download the dataset as a CSV when not logged in fails

Steps to Reproduce

1. Create a query that returns a table
2. Create a public link using "embed" (use the src argument)
3. Open the link from an anonymous browser window
4. Click Download Dataset CSV

Getting

Technical details:

• Redash Version: 0.11.1+b2095
• Browser/OS: Chrome / Mac

[lukas-wu]

Issue replicable also on:
Technical details:

Redash Version: 0.11.0+b2016
Browser/OS: Chrome / Windows 10

[mycodecrafting]

It also fails for Excel. Looks to me like the issue is that the download links do not contain the api_key. If you add the api_key to the download links, they then work. Hopefully that's not too difficult to fix in the code.