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+====== Reverse-Proxying Node-RED and Alexa Philips Hue Emulation Bridge ======
+The Alexa Philips Hue Emulation Bridge for node-red provided by the ''node-red-contrib-amazon-echo'' package needs to listen on port ''80'' for HTTP requests sent by Amazon Alexa devices performing discovery. Instructions for the ''node-red-contrib-amazon-echo'' package include setting up a port redirect from port ''8080'' used by the Amazon Echo Hub node in the node-red interface to port ''80''. Unfortunately, since port ''80'' is occupied, a webserver performing reverse proxying cannot be placed in front of node-red without some tricks.
+One solution is to use nginx and regular expressions in an attempt to match the user-agent of Amazon Echo devices in order to redirect regular HTTP requests to node-red and HTTP requests from Amazon Alexa devices to the ''node-red-contrib-amazon-echo'' listening port on ''8080'':
+<code>
+map "$http_user_agent" $targetupstream {
+  default        http://127.0.0.1:1880;
+  "~AEO[A-Z]{2,3} Build\/[A-Z0-9]+" http://127.0.0.1:8080;
+}
+server {
+        listen 80;
+        server_name mynoderedserver.tld;
+        access_log /var/log/nginx/access.log;
+        location / {
+                proxy_pass $targetupstream;
+                proxy_http_version 1.1;
+                proxy_set_header Upgrade $http_upgrade;
+                proxy_set_header Connection "upgrade";
+        }
+}
+</code>
+The map at the top is responsible for conditionally proxying requests based on the user agents: by default, all requests to the server ''mynoderedserver.tld'' are passed to node-red on port ''1880'' and requests that match the regular expression ''~AEO[A-Z]{2,3} Build\/[A-Z0-9]+'' are delivered to port ''8080'' on which the Amazon Alexa Philips Hue Emulation bridge (provided by ''node-red-contrib-amazon-echo') is listening.
+The result is that a request via a browser to ''<nowiki>http://mynoderedserver.tld</nowiki>'' will open up the node-red flow design interface. Similarly, requests to: ''<nowiki>http://mynoderedserver.tld/ui</nowiki>'' will open the dashboard provided by ''node-red-dashboard'' package. This removes the need to memorize ports and/or IP addresses.