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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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)