Today the wind is gentle and the weather is sunny. I received an invitation for a written examination.
It was made by a website called xxx (I won’t tell you the name). Its editing functions are hard to describe, but you can’t leave the screen.
Every time you leave the screen, an alert will be displayed. You said that your online environment is not good, but you still don't let people cut the screen to debug. Isn't it natural?
Of course I can't be afraid because I'm brave. I'm just thinking about how to close his leave page.
I was originally wondering if I needed to use some js events to prevent it, but I opened the console to take a look.
Good guy, this is to directly send the number of screen cuts to the background. I originally thought it would upload it uniformly at the end, but the result is that it will be uploaded every time the screen is cut.
Then let's take a look at the url we want to intercept.
We can see that the middle section should be the exam number, and we only need to intercept all requests sent to this URL.
Now any chrome plug-in that intercepts http requests is over.
## Technical summary
Let’s start with the technical summary. When we write an online written test system, we need to make it as easy to use as possible. Secondly, regarding a series of information that may be cheating, it is recommended to encrypt and transmit it.
Finally, I was thinking that when he calls the camera, it shouldn’t be for real-time monitoring. The bandwidth is too large. It should be for screenshot mode monitoring. Next time, I will try to upload one photo of Daniel Wu each time.