Getting status 0/cancelled in network's tab upon link tracking event but working fine with Ctrl+Click on link

I am trying to implement link tracking(s.tl) but end up getting status 0/ cancelled in the network's tab upon click event. But getting status 200 if try to press Ctrl+ left mouse click.

See below the code

<a href="VisitorAPI.html" onclick="
s.linkTrackVars='prop1,eVar1,events';
s.linkTrackEvents='event1';
s.prop2=s.eVar2='m1';
s.events='event1';
s.tl(this,'e','c1');
">C1</a>

Check out the image attached for status message.