Authentication for basicly every webpage after /?

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How can I get authentication for every webpage after /

because I use it for home automation, basicly every webpage needs to be protected. and I also have webpages with varaibles in the url

for exampel to set temperature of a thermostat the url is /set_temp=21 or /set_temp=25 etc..

so basicly all pages after / could use autentication

is there perhaps some varaible for this code:

webserver.addCommand("....", &privateCmd);

so basicly ever page after / will have authentication?