Add curly brace escaping feature

Double curly braces {{ ... }} are used to inject Insomnia environment variables, but if your payload has a double curly braces pattern, the only way to send this to the upstream is by disabling rendering of the request body. However, that means you can’t use environment variables at all in this payload.

It would be nice to be able to escape Insomnia environment variables so you can use both patterns in one payload.

[develohpanda]

Thanks for that @inabajunmr! Just tested it myself and it seems to work as well, although Insomnia attempts to add a pill in the UI for {{ '{{variable}}' }} and spectacularly fails. The syntax for the raw tag would be {% raw %}{{variable}}{% endraw %} which is also standard Nunjucks syntax and has special case handling in Insomnia.

@iinuwa I will close this issue as resolved because it does seem to work without disabling rendering entirely - anything inside the raw tags will be used raw, and other areas in the same text field can still use environment variables.

Please re-open this issue if it does not cater for your use case!

[inabajunmr]

The following pattern I tested works well also.

{{ '{{variable}}' }}

ref. https://github.com/mozilla/nunjucks/issues/604#issuecomment-465493535