How to query a package's manifest?

[John Smith]

How do I query a package's manifest (*.nuspec)?
I've tried the address "http://proget.company.com/nuget/package/{packageId}/{packageVersion}/{packageId}.nuspec", but it returns "400: bad request."

Product: BuildMaster
Version: 6.0.6

[thoven]

I can't seem to find any indication that endpoint is part of official NuGet API, but in ProGet if you want a specific file you can query as per this example:

http://proget.company.com/package-files/download?packageId={packageId}&version={packageVersion}&feedName={feedName}&path={packageId}.nuspec

A live example:

https://proget.inedo.com/package-files/download?packageId=InedoLib&version=528.0.0&feedName=ExternalBuild&path=InedoLib.nuspec