WordPress doesnt recognize Caddy, so I would like to simulate fastcgi as nginx, which should be by changing a Server header to nginx value.
I would expect the something like header_upstream Server nginx for proxy configuration to work with fastcgi.
Something like this
:2015 {
fastcgi / 127.0.0.1:9000 php {
header_upstream Server "nginx/caddy"
}
}
I didn’t think HTTP headers existed in the context of a FastCGI proxy, or that WordPress “recognises” any web server via FastCGI…
The closest analogue available to you would be setting an environmental variable with env, but I can’t imagine how it would help with whatever issue you’re having.
Im not sure either. But echo $_SERVER['SERVER_SOFTWARE']; does really output Caddy/0.10.7 - so Caddy must somehow modify the headers.
PHP documentation mentions the source of that constant is from the headers. http://php.net/manual/en/reserved.variables.server.php
Those are set here, as environmental variables:
You should be able to use env to override or set additional variables, which happens here, shortly after the above:
Are you able to elaborate on how this would fix your issue with Caddy/WordPress?
Thank you, this solved my issue 
:2015 {
fastcgi / 127.0.0.1:9000 php {
env SERVER_SOFTWARE "nginx/caddy"
}
}
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