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Connie744

: 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

Posted in: #Http #HttpHeaders #WebDevelopment

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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