Why is my iframe blocked by cross origin even it is not


Why is my iframe blocked by cross origin even it is not



I have a <iframe> inside a <div>. My outer url is http://localhost:9090 and the src in iframe is http://localhost:9090/Server/v1. In my outer context I have below code to access iframe dom:


<iframe>


<div>


http://localhost:9090


http://localhost:9090/Server/v1


const f1 = window.frames[iframeName];
const iFrameHead = f1.document.getElementsByTagName("head")[0];



and I get an exception on the second line:



Uncaught DOMException: Blocked a frame with origin
"http://localhost:9090" from accessing a cross-origin frame.



The reason I want to access ifame dom is that I need to insert a script into that iframe. The src in iframe has the same protocol, hostname and port number. What I don't understand is the iframe is on the same origin as the parent context. Why does it complain about the cross origin?



After some debugging, I found there is because the iframe was redirected to a different domain than its src. I wonder whether there is a workaround to insert a script into this iframe?


iframe


src





different port, try to make a ssh tunnel. ssh.com/ssh/tunneling/example
– Santiago Rebella
Jun 30 at 0:37






both use 9090 as the port number. Why do you say it is a different port?
– Zhao Yi
Jun 30 at 0:44





just a shot in the air, need more info whats going on, thats tipically that error msg
– Santiago Rebella
Jun 30 at 0:54





which error msg said about different port?
– Zhao Yi
Jun 30 at 0:56





are you in https?
– Santiago Rebella
Jun 30 at 1:02









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