Allow usage of custom verbs

[stephane-benoist]

Description

Allow to use custom HTTP verbs Look at tests and doc to see how to do it.

Corresponding issue: #3535

Testing

I have add unit tests to prove functionality

Checklist

• [X] I have read the contribution guidelines
• [X] I have targeted this PR against the correct branch (master for website changes, dev for source changes)
• [ ] This is either a bugfix, a documentation update, or a new feature that has been explicitly approved via an issue
• [X] I ran the test suite locally (npm run test) and verified that it succeeded