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By setting the pathPrefix, all incoming requests are expected to have its uri starting with the path. Then, before doing resource lookup, the prefix is trimmed from the path. BUG=https://code.google.com/p/dart/issues/detail?id=17353 R=kevmoo@google.com Review URL: https://codereview.chromium.org//424063002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@38720 260f80e4-7a28-3924-810f-c04153c831b5