ScriptIntercept does not work

[jinxingtt]

I use the script try to intercept http request, and add header to it. however it does not work, here is the code

if (request != null){
result = false;
intercept_response = false;
request.addHeader ("TestHeader", "test");
}

Anyone know the reason? Does this feature need to be run on rooted phone?
I checked the http request in chrome dev tool, no headers added to each http or https request

[SuppSandroB]

No need to have rooted phone if android proxy settings points to SandroProxy port.