xianshun163 commented on issue #6352:
URL: https://github.com/apache/apisix/issues/6352#issuecomment-1043941209


   I  modify it like this:  
   1、in balancer.lua     local function pick_server(route, ctx)
              -- when all node is fail  
               ctx.balancer_server = my_backup_gateway_server
               ctx.var.upstream_uri =  ctx.var._cache.real_request_uri
               ctx.donot_change_uri = true
   2、in balancer.lua     function _M.run(route, ctx, plugin_funcs)
            if (run or header_changed  or ctx.donot_change_uri ) and 
balancer.recreate_request  then
               core.log.warn("do recreate_request")
               balancer.recreate_request()
           end
   


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