I found this connection in the Ngnix log. What is this garbled code?

I found this connection in the Ngnix log. What is this garbled code. Contact. php? Summary & amp; nicknamexB7xA2xB8xF6xCCxFB & amp; englishnamejohn & amp; summary... I found such a connection in the Ngnix log. What is this garbled code.

contact.php?realname=xCDxC0xBAxE9xB8xD5&nickname=xB7xA2xB8xF6xCCxFB&englishname=john&address=xB6xABxC3xF7xCFxD8xB2xBDxD0xD0xBDxD6xB0xD7xD0xD5&zip_code=445032

There is a form on the website that allows visitors to fill in the information and mail the information. Finally, I can see that the name in the data table is empty. The request log found in the Ngnix log is like this, how can this happen?
At the beginning, I thought something was done by someone, but I saw a lot of garbled characters like this, And urldecode could not be implemented.
I don't know what the code is. How is it generated?

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I found this connection in the Ngnix log. What is this garbled code.

contact.php?realname=xCDxC0xBAxE9xB8xD5&nickname=xB7xA2xB8xF6xCCxFB&englishname=john&address=xB6xABxC3xF7xCFxD8xB2xBDxD0xD0xBDxD6xB0xD7xD0xD5&zip_code=445032

There is a form on the website that allows visitors to fill in the information and mail the information. Finally, I can see that the name in the data table is empty. The request log found in the Ngnix log is like this, how can this happen?
At the beginning, I thought something was done by someone, but I saw a lot of garbled characters like this, And urldecode could not be implemented.
I don't know what the code is. How is it generated?

XCDxC0xBAxE9xB8xD5 // tu honggang

XB7xA2xB8xF6xCCxFB // post

Replace x with %, and then perform urldecode according to gb2312 encoding.

At present, it is unclear why your nginx will be encoded like this. Let's take a look at the charset and nginx log configurations on the Web page first?