Why is my iPhone acting weird after updating it?

When I'm using 3G and I search for something on google or try to open a link from my Facebook app, I get a message that says
"Response Error.
Technical description:
502 Bad Gateway - Response Error, a bad response was received from another proxy server or the destination origin server."

What the hell does that mean?

Just refresh of check back later, if it doesn't work it's a faulty link

Unsafe and faulty link

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