Need help with Server Errors I do not understand

[cowgod]

I have tons of these server errors every single day. I do not know what is causing them or how to prevent them from happening. They all seem to be trying to proxy out links to very shady websites, but I don't know where or if they are actually being posted. What are these errors and how can I stop these from happening?

Here's the details of one of the errors.

Server Error Log​

Error Info
Stack Trace
Request State

...

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Need help with Server Errors I do not understand

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