eos: fixed use of "app" tag #5130
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- direct links to files - not yet configurable to choose between id or path based links
added trace id as `x-request-id` response header
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In this PR the use of the
eos.appquery parameter (for xrootd) or header (for HTTP traffic) is reviewed and "cleaned up"::as this is used as separator in case of lockshttp/as nowadays EOS is overriding the app tag withhttp/in front for any traffic that comes via HTTP. As Reva is an HTTP client, we enforce it in all cases (even when it's used via xrootd)The latter point is important to make sure lock enforcing works correctly, when the app actually reflects a web app for which a file was locked.
Side note: the
eos.appparameter has been overloaded to serve two purposes in EOS, that is traffic tagging for monitoring purposes and file locking by apps. This was a sub-optimal design choice, and it implies that we have to fiddle with the extrahttp/prefix...