003-substitution-variables.md

Substitution Variables

Perry is working on a system that parses HTML, and passes it through a series of filter programs that may do additional work. He wants to test passing special characters all the way through the network stack.

To this end Perry creates a Routes file:

route {
  host = "example.com"
  path = "/"
  type = "http"
}

And a mock file, at /mocks/example.com/index.mock.

Hello, {{ .Name }}

Now he can iterate different possible characters by passing them as "Substitution Variables".

curl -X POST -F "key=Name" -F "value=World" squid.proxy/substitution-variables
parse
### Hello, World
curl -X POST -F "key=Name" -F "value=>&2" squid.proxy/substitution-variables
parse
### Hello, >&2
curl -X POST -F "key=Name" -F 'value=!!_@3%2F' squid.proxy/substitution-variables
parse
### Hello, !!_@3%2F