Processing redirection string inside the NGINX script, is possible?

Question

I am looking for a "full NGINX solution", withou intermediary redirection... But I need some external processing by "my Name-Resolver", as illustred with this execute fantasy:

server {
  server_name resolver.mydomain.com;
  execute xx = http://localhos:123456/myNameResolver/$request_uri;
  rewrite ^ http://www.adifferentdomain.com$xx? permanent;
}

So, is possible to do something like this? perhaps using a kind of fastcgi_pass but only to return a string, not to bypass all HTTP resolution.

See also this question about user-defined functions in Nginx. — Peter Krauss
– Peter Krauss, Commented Aug 21, 2018 at 18:41

ErvalhouS · Accepted Answer · 2018-08-21 18:51:19Z

1

Well, you can use HttpLuaModule, which can execute commands and store them in variables if needed.

location / {
  server_name resolver.mydomain.com;
  # Get response via lua script.
  set_by_lua_file $xx 'resolver-script.lua' $request_uri;
  rewrite ^ http://www.adifferentdomain.com$xx? permanent;
}

You just need a Lua script to do your request for you, try something like this using your $request_uri as arg[1], because it is being considered as a command line argument

edited Aug 21, 2018 at 18:51

answered Aug 21, 2018 at 18:35

ErvalhouS

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6 Comments

Peter Krauss Over a year ago

But what the difference between LuaModule and usual Apache-modules or Nginx's fastcgi_pass used for PHP, Python, etc.? It is only a "language flavor", or HttpLuaModule is a real fast complement and low-overhead for Nginx's HTTP processing?

ErvalhouS Over a year ago

You need to do something that a webserver is not supposed to do, which is embedding a second request response in the response itself. This is usually done by some kind of application, or by using PHP, Python etc. Lua is just a "native" NGINX solution.

Peter Krauss Over a year ago

Ops, before discuss... How to send a parameter ($request_uri at my illustration) to the function-call used by $xx?

Peter Krauss Over a year ago

Is a good answer (!), only a final check. There are also a "native" NGINX JavaScript Module... Can I use set_by_js_file instead Lua? Or this magic is only offered by Lua?

ErvalhouS Over a year ago

Not exactly. Check out their API documentation down in the example section, maybe it will shed some light into your solution

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