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Posted to issues@trafficcontrol.apache.org by GitBox <gi...@apache.org> on 2019/07/02 16:30:29 UTC

[GitHub] [trafficcontrol] rob05c commented on issue #3567: New fakeOrigin testing tool

rob05c commented on issue #3567: New fakeOrigin testing tool
URL: https://github.com/apache/trafficcontrol/pull/3567#issuecomment-507751812
 
 
   >still not clear on the purpose of a BodyInterceptor
   
   It allows the HTTP handling code to defer writing the status code, headers, and body until after the real wrapped handler returned, but still let the real Handler be a standard `http.HandlerFunc`.
   
   For example, here it's being used to add a header after the "real" handler has written everything (which wouldn't normally be possible, because headers must be written before the body):
   
   https://github.com/apache/trafficcontrol/pull/3567/files#diff-414b9bb76c9e75065ecc98b9d0470b07R137
   
   And here it's being used to get the size of the body written, to log it:
   https://github.com/apache/trafficcontrol/pull/3567/files#diff-414b9bb76c9e75065ecc98b9d0470b07R109

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