Response

Best Practice

To simplify debugging, it is better to use structured logging and include a request id into all log messages and HTTP server response.

Adding such request id is as simple as adding a method for reblocks/server:handle-http-request generic-function:

(defmethod reblocks/server:handle-http-request :around ((server t) env)
  (let ((request-id (princ-to-string
                     (uuid:make-v4-uuid))))
    (reblocks/response:add-header :x-request-id
                                  request-id)
    (log4cl-extras/context:with-fields (:request-id request-id)
      (call-next-method))))

Here we use log4cl-extras/context:with-fields macro for structured logging and reblocks/response:add-header to add the X-Request-Id header to webserver's response.

Also, you might want to define a method for reblocks/error-handler:on-error generic-function and show current request-id to the user. This way he could provide id to support simplifying issue investigation.