orted for external destinations. Weighted (version-based) routing is not possible, however, since there is no notion of multiple versions of an external service.</p></main></div><div class="col-12 col-md-2 d-none d-lg-block"><nav class="toc"><div class="spacer"></div><div class="directory" role="directory"><ul><li><a href="#route-rules">Route Rules</a><ul><li><a href="#qualify-rules-by-destination">Qualify rules by destination</a></li><li><a href="#qualify-rules-by-sourceheaders">Qualify rules by source/hea