I\'m using the awesome Paw software to make Htpp requests. It has a lot of great features including the ability to compute HMAC-SHA256 signatures, unfortunately, I cannot fi
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Old version/original answer (not up-to-date):
There is not (yet) a Dynamic Value that returns the URL, that's a missing thing. But here's a workaround:
In the HMAC-SHA256 "Input" field, right-click and choose "Extensions" > "Custom". You'll have a JavaScript text field, make the function return:
return context.getCurrentRequest().url;
See the Extensions Reference for more details.