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Home/ Questions/Q 971093
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T02:54:27+00:00 2026-05-16T02:54:27+00:00

How many characters can the value of the X-Forwarded-For (XFF) HTTP header value be?

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How many characters can the value of the X-Forwarded-For (XFF) HTTP header value be?

Example is:
X-Forwarded-For: client1, proxy1, proxy2

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  1. Editorial Team
    Editorial Team
    2026-05-16T02:54:28+00:00Added an answer on May 16, 2026 at 2:54 am

    AFAIK, there is no limit. Note that you shouldn’t rely on its value; it can be spoofed easily. (Note however that if you’re using a load-balancing proxy that overwrites this value, you can rely on it as you’re setting it yourself)

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