phpgoogle-chromehttp-headers

What is the HTTP_X_CLIENT_DATA in the $_SERVER array?

I see an element in the $_SERVER array called HTTP_X_CLIENT_DATA - $_SERVER['HTTP_X_CLIENT_DATA'], and its value looks like some kind of base64-encoded string. What is this element used for?

Here is an example value, which I tried decoding but seems to be also encrypted?

CJa2yQEIprbJAQjBtskBCPqcygEIqZ3KAQ==

Solution

  • It appears to be both uncommon and non-standard. Here's a List of HTTP Header Fields.