zmq_http_load_balancer.txt

      +-[HTTP SERVER]--+    +----------------------+
      |     Incoming   |    |    Misc ZMQ Service  |
      +-----[XREQ]-----+    +-------[XREQ]---------+
                    \      /
                     \    /
               +-----[XREP]-----+
               |      RPROXY    |
               +-----[XREQ]-----+
                /              \ 
               /                \  
     +-----[XREP]-----+  +-----[XREP]-----+
     | RPROXY HTTP[1] |  | RPROXY HTTP[n] |
     +-[HTTP CLIENT]--+  +-[HTTP CLIENT]--+
             |                   |
             |                   |
     +--[HTTP Server]-+ +--[HTTP Server]-+
     |   HTTP Backend | |  HTTP Backend  |
     +----------------+ +----------------+

  +-[HTTP SERVER]--+    +----------------------+
  |     Incoming   |    |    Misc ZMQ Service  |
  +-----[XREQ]-----+    +-------[XREQ]---------+
                \      /
                 \    /
           +-----[XREP]-----+
           |      RPROXY    |
           +-----[XREP]-----+
            /              \ 
           /                \  
 +-----[XREQ]-----+  +-----[XREQ]-----+
 | RPROXY HTTP[1] |  | RPROXY HTTP[n] |
 +-[HTTP CLIENT]--+  +-[HTTP CLIENT]--+
         |                   |
         |                   |
 +--[HTTP Server]-+ +--[HTTP Server]-+
 |   HTTP Backend | |  HTTP Backend  |
 +----------------+ +----------------+

• Routers (XREP) can address N nodes.

• Dealers (XREQ) can do async requests to N papa (REP) workers and/or async replies to 1 router node.

  +-[HTTP SERVER]--+ +----------------------+
  | Incoming | | Misc ZMQ Service |
  +----[dealer]----+ +------[dealer]--------+
  \ /
  \ /
  +-----[router]-----+
  | RPROXY |
  +-----[router]-----+
  / \
  / \
  +----[dealer]----+ +----[dealer]----+
  | RPROXY HTTP[1] | | RPROXY HTTP[n] |
  +-[HTTP CLIENT]--+ +-[HTTP CLIENT]--+
  | |
  | |
  +--[HTTP Server]-+ +--[HTTP Server]-+
  | HTTP Backend | | HTTP Backend |
  +----------------+ +----------------+