Sprinting | Request Methods
By default, Blitz uses GET for all the requests. But you change this easily with the --request option. For example:
does a form POST to the specified URL, along with the data that is sent with a Content-Type of application/x-www-form-urlencoded.
Here's another example of adding a document to CouchDB (line breaks added for clarity)
-H 'Content-Type: application/json'
You can parameterize the POST data with Variables too!