Proxying on an HTTP backend and sending back 50x errors 20% of the time:
$ vaurien --protocol http --proxy 0.0.0.0:8888 --backend blog.ziade.org:80 \
--behavior 20:error
An SSL SMTP proxy with a 5% error rate and 10% delays:
$ vaurien --proxy 0.0.0.0:6565 --backend mail.example.com:465 \
--protocol smtp --behavior 5:error,10:delay
An SSL SMTP Proxy that starts to error out after 12 calls (so in the middle of the transaction):
$ vaurien --proxy 0.0.0.0:6565 --backend mail.example.com:465 \
--protocol smtp --behavior 100:error --behavior-error-warmup 12
Adding a 1 second delay on every call to a MySQL server:
$ vaurien --proxy 0.0.0.0:3307 --backend 0.0.0.0:3306 --stay-connected --behavior 100:delay \
--handler-delay-sleep 1
A quick’n’dirty SSH tunnel from your box to another box:
$ vaurien --stay-connected --proxy 0.0.0.0:8887 --backend 192.168.1.276:22 \
--protocol-tcp-keep-alive