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Health check the fwd host. Add the following parameters to the config file:

[http.forward]
host = "" # fwd_host instead of fwd_host

[http.forward.health_check]
interval = 5 # Interval in seconds
url = "/" # Relative to host
threshold = 3 # Consecutive healthy/unhealthy checks to flag the host as active/inactive
max_execution_time = 5 # Above this response time (in seconds), we'll consider it a failed check

If an instance is unhealthy, we need to either:

1. Stop consuming new messages from the service request queue, or
2. When a new request gets routed our way, we'll:
   IF the AMQP header unhealthy_count exists and it is >= 3, THEN we'll return a no_available_instances error to the response_queue
   ELSE, create or increment the unhealthy_count AMQP header by 1 and put the message back in the request queue so other instances can process it.

Add a feature where an http request that doesn't need immediate response gets the response back via a webhook.
We need to add a parameter webhook_url to the request message or something. Maybe via a request header or a get parameter?