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kong.client

Client information module A set of functions to retrieve information about the client connecting to Kong in the context of a given request.

See also: nginx.org/en/docs/http/ngx_http_realip_module.html

Table of Contents

kong.client.get_ip()

Returns the remote address of the client making the request. This will always return the address of the client directly connecting to Kong. That is, in cases when a load balancer is in front of Kong, this function will return the load balancer's address, and not that of the downstream client.

Phases

  • certificate, rewrite, access, header_filter, body_filter, log

Returns

  • string ip The remote address of the client making the request

Usage

-- Given a client with IP 127.0.0.1 making connection through
-- a load balancer with IP 10.0.0.1 to Kong answering the request for
-- https://example.com:1234/v1/movies
kong.client.get_ip() -- "10.0.0.1"

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kong.client.get_forwarded_ip()

Returns the remote address of the client making the request. Unlike kong.client.get_ip, this function will consider forwarded addresses in cases when a load balancer is in front of Kong. Whether this function returns a forwarded address or not depends on several Kong configuration parameters:

Phases

  • certificate, rewrite, access, header_filter, body_filter, log

Returns

  • string ip The remote address of the client making the request, considering forwarded addresses

Usage

-- Given a client with IP 127.0.0.1 making connection through
-- a load balancer with IP 10.0.0.1 to Kong answering the request for
-- https://username:password@example.com:1234/v1/movies

kong.request.get_forwarded_ip() -- "127.0.0.1"

-- Note: assuming that 10.0.0.1 is one of the trusted IPs, and that
-- the load balancer adds the right headers matching with the configuration
-- of `real_ip_header`, e.g. `proxy_protocol`.

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kong.client.get_port()

Returns the remote port of the client making the request. This will always return the port of the client directly connecting to Kong. That is, in cases when a load balancer is in front of Kong, this function will return load balancer's port, and not that of the downstream client.

Phases

  • certificate, rewrite, access, header_filter, body_filter, log

Returns

  • number The remote client port

Usage

-- [client]:40000 <-> 80:[balancer]:30000 <-> 80:[kong]:20000 <-> 80:[service]
kong.client.get_port() -- 30000

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kong.client.get_forwarded_port()

Returns the remote port of the client making the request. Unlike kong.client.get_port, this function will consider forwarded ports in cases when a load balancer is in front of Kong. Whether this function returns a forwarded port or not depends on several Kong configuration parameters:

Phases

  • certificate, rewrite, access, header_filter, body_filter, log

Returns

  • number The remote client port, considering forwarded ports

Usage

-- [client]:40000 <-> 80:[balancer]:30000 <-> 80:[kong]:20000 <-> 80:[service]
kong.client.get_forwarded_port() -- 40000

-- Note: assuming that [balancer] is one of the trusted IPs, and that
-- the load balancer adds the right headers matching with the configuration
-- of `real_ip_header`, e.g. `proxy_protocol`.

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