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Home/ Questions/Q 867991
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T10:04:06+00:00 2026-05-15T10:04:06+00:00

While surfing facebook and using the Firebug network debugger I noticed that facebook’s AJAX

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While surfing facebook and using the Firebug network debugger I noticed that facebook’s AJAX responses all start with an empty for loop.

Example:

for(;;);{...}

Does anyone know why this is done? I assume it’s to prevent some sort of XSS attack but I don’t totally understand. Thanks!

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  1. Editorial Team
    Editorial Team
    2026-05-15T10:04:07+00:00Added an answer on May 15, 2026 at 10:04 am

    Like google’s

    while(1);
    

    it done for preventing of including this in <script> with further using the data

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