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My research shows that only the Host, Referer, and User-Agent headers can be spoofed. (source)
Is this a correct assumption to make? The security of a site I am building may require that ‘x-requested-with’ cannot be faked. This is far from ideal but may be the only avenue I have.
Just about anything in HTTP can be spoofed. The level of ‘spoofability’ is hard to determine. It’s fairly trivial to craft a request with any header value I desire.
If it’s your only option, so be it, but I wouldn’t want to use a site that relied on it for anything important.