How can I intercept a response from a server running in the back

milind.gupta · 2018-02-04T00:49:09+00:00

Hi David,*_by_lua directives cannot be nested or inherited. The location blocks themselves can be nested, and Lua directive handlers can be placed within the...

How can I intercept a response from a server running in the back

milind.gupta

So thanks to help on this forum I was able to redirect response and control them using proxy_pass and access_by_lua directives:

location = /access-test {
access_by_lua_block {
return
}
proxy_pass https://www.google.com/;
}

but this denies access:

location = /access-test {
access_by_lua_block {
ngx.exit( ngx.HTTP_FORBIDDEN )
}
proxy_pass https://www.google.com/;
}

Now I wanted to intercept what the proxy_pass server responds and add some HTML to that response and then send it back to the user. How can I do that in this scheme?

Thanks,

Milind

igor.clark

Hi again Milind, you could try using https://github.com/openresty/replace-filter-nginx-module

There are a lot of really useful modules available for OpenResty, many under the https://github.com/openresty organisation. If not there they're generally easy to google, and often named something like lua-resty-*, like "lua-resty-http" or "lua-resty-redis". The above one was the first google result for "openresty proxy filter" :-)

Cheers,

Igor

On 03/02/2018 08:49, Milind Gupta wrote:

So thanks to help on this forum I was able to redirect response and control them using proxy_pass and access_by_lua directives:

location = /access-test {
access_by_lua_block {
return
}
proxy_pass https://www.google.com/;
}

but this denies access:

location = /access-test {
access_by_lua_block {
ngx.exit( ngx.HTTP_FORBIDDEN )
}
proxy_pass https://www.google.com/;
}

Now I wanted to intercept what the proxy_pass server responds and add some HTML to that response and then send it back to the user. How can I do that in this scheme?

Thanks,

Milind

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