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: What are these headers and values: HTTP_X_FB_HTTP_ENGINE = Liger, HTTP_X_PURPOSE = preview and HTTP_X_REQUESTED_WITH = com.facebook.katana? I'm trying to debug an issue in my website, and i see
I'm trying to debug an issue in my website, and i see these headers in my page view log:
[HTTP_X_FB_HTTP_ENGINE] => Liger
[HTTP_X_PURPOSE] => preview
[HTTP_X_REQUESTED_WITH] => com.facebook.katana
They are sent by visits using Facebook's in-app browser. HTTP_X_FB_HTTP_ENGINE=Liger sometimes comes together with HTTP_X_PURPOSE=preview.
What are these headers and these specific values? How they affect a request?
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