FIX: set the Host header on the upstream block
          #900
        
          
      
                
     Merged
            
            
          
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Using e.g.
proxy_pass http://discourseresets the Host header on the upstreamrequest to
discourse.This would break multisites, so we don't want that; the most effetive way to
ensure it's set properly is to
set_headerin the upstream block.