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Home/ Questions/Q 5963295
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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T19:13:46+00:00 2026-05-22T19:13:46+00:00

Refused to set unsafe header Connection I get this error on Chrome when running

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Refused to set unsafe header “Connection”

I get this error on Chrome when running a request by ajax (MooTools 1.1) ?

How to solve it ?

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  1. Editorial Team
    Editorial Team
    2026-05-22T19:13:47+00:00Added an answer on May 22, 2026 at 7:13 pm

    The issue was due to a Mootools 1.12
    bug where it is trying to set a
    protected value during an Ajax
    request.

    See http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader-method

    References: http://www.sourcecoast.com/forums/topic?id=1076&p=1#p4038

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