[GitHub] [trafficcontrol] rob05c opened a new issue #3509: Add Traffic Ops If-Match and If-Unmodified-Since Support in Server and Clients

[GitBox <gi...@apache.org>]

rob05c opened a new issue #3509: Add Traffic Ops If-Match and If-Unmodified-Since Support in Server and Clients
URL: https://github.com/apache/trafficcontrol/issues/3509
 
 
   Currently, there is a race condition if multiple people PUT an object, they will overwrite each-other without realizing it.
   
   HTTP has a well-established solution for this: `If-Match` and `If-Unmodified-Since`.
   https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Unmodified-Since
   https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Match
   
   We should implement this, to prevent races and people accidentally overwriting each other.
   
   It shouldn't be too difficult to implement. We can generate an ETag+Last-Modified header from the resource's `last_updated` field, and likewise compare them when we get a request with IM or IUS.
   
   It's tempting to add the `bug` tag, since this is a logical bug, even if it's not a code bug. I won't, but I wouldn't object if someone else did.

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