Artifacts API error: "The browser (or proxy) sent a request that this server could not understand."

[maurovanetti]

Hello.
I'm updating our workflow in order to use the Artifacts API to generate public URLs for our builds.
Using the usual API key in the x-auth-token header and a private URL found in the response by the Builds API, I get the following response:

{ "error": "The browser (or proxy) sent a request that this server could not understand." }

I noticed that this response only occurs when the API key is right and the private URL corresponds to an actual artifact's private URL. In the other cases, the error message is different, which proves that my POST request is correct.

What am I doing wrong?
Thanks for your help!

[maurovanetti]

I guess this PR may answer my question: #1388
expiresAt is not optional.