These days we might have multiple local applications that are running on different ports (e.g: http://localhost:3000, http://localhost:3001 and so on). This is pretty troublesome as we have to remember which application is running on which port.
haproxy can redirect a URL to a certain host with different port (this is impossible with hosts). Here's how we can do it in OS X:
Install haproxy
brew install haproxy
Create a new file at /usr/local/etc/haproxy.cfg and put these contents (customize as you wish):
global
maxconn 4096
daemon
defaults
log global
mode http
timeout connect 5000ms
timeout client 50000ms
timeout server 50000ms
frontend web_gateway
bind *:80
# https://cbonte.github.io/haproxy-dconv/1.7/configuration.html#7.1
acl is_web hdr_beg(host) myapp.local
acl is_api hdr(host) -i api.myapp.local
acl is_admin hdr(host) -i admin.myapp.local
use_backend web if is_web
use_backend api if is_api
use_backend admin if is_admin
backend web
# https://cbonte.github.io/haproxy-dconv/1.7/configuration.html#server
server web 127.0.0.1:3000
backend api
server api 127.0.0.1:3001
backend admin
server admin 127.0.0.1:3002
Make sure you put the hosts declared before in /etc/hosts:
127.0.0.1 localhost
127.0.0.1 myapp.local.sg # We can use different domain here
127.0.0.1 myapp.local.hk
127.0.0.1 admin.myapp.local
127.0.0.1 api.myapp.local
Run this command to ensure haproxy will always be running
brew services start haproxy
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