Disable headers from being passed to upstream service
You can pass Lua code as a string to the Post-Function plugin.
In this example, the plugin runs in the access phase to disable the X-Forwarded-Host header
so that it doesn’t get sent to the upstream service.
Add this section to your declarative configuration file:
_format_version: "3.0"
plugins:
- name: post-function
config:
access:
- ngx.var.upstream_x_forwarded_host=nil
Make the following request:
curl -i -X POST http://localhost:8001/plugins/ \
--header "Accept: application/json" \
--header "Content-Type: application/json" \
--data '
{
"name": "post-function",
"config": {
"access": [
"ngx.var.upstream_x_forwarded_host=nil"
]
}
}
'
Make the following request:
curl -X POST https://{region}.api.konghq.com/v2/control-planes/{controlPlaneId}/core-entities/plugins/ \
--header "accept: application/json" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer $KONNECT_TOKEN" \
--data '
{
"name": "post-function",
"config": {
"access": [
"ngx.var.upstream_x_forwarded_host=nil"
]
}
}
'
Make sure to replace the following placeholders with your own values:
-
region: Geographic region where your Kong Konnect is hosted and operates. -
controlPlaneId: Theidof the control plane. -
KONNECT_TOKEN: Your Personal Access Token (PAT) associated with your Konnect account.
See the Konnect API reference to learn about region-specific URLs and personal access tokens.
echo "
apiVersion: configuration.konghq.com/v1
kind: KongClusterPlugin
metadata:
name: post-function
namespace: kong
annotations:
kubernetes.io/ingress.class: kong
labels:
global: 'true'
config:
access:
- ngx.var.upstream_x_forwarded_host=nil
plugin: post-function
" | kubectl apply -f -
Prerequisite: Configure your Personal Access Token
terraform {
required_providers {
konnect = {
source = "kong/konnect"
}
}
}
provider "konnect" {
personal_access_token = "$KONNECT_TOKEN"
server_url = "https://us.api.konghq.com/"
}
Add the following to your Terraform configuration to create a Konnect Gateway Plugin:
resource "konnect_gateway_plugin_post_function" "my_post_function" {
enabled = true
config = {
access = ["ngx.var.upstream_x_forwarded_host=nil"]
}
control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
}
Add this section to your declarative configuration file:
_format_version: "3.0"
plugins:
- name: post-function
service: serviceName|Id
config:
access:
- ngx.var.upstream_x_forwarded_host=nil
Make sure to replace the following placeholders with your own values:
-
serviceName|Id: Theidornameof the service the plugin configuration will target.
Make the following request:
curl -i -X POST http://localhost:8001/services/{serviceName|Id}/plugins/ \
--header "Accept: application/json" \
--header "Content-Type: application/json" \
--data '
{
"name": "post-function",
"config": {
"access": [
"ngx.var.upstream_x_forwarded_host=nil"
]
}
}
'
Make sure to replace the following placeholders with your own values:
-
serviceName|Id: Theidornameof the service the plugin configuration will target.
Make the following request:
curl -X POST https://{region}.api.konghq.com/v2/control-planes/{controlPlaneId}/core-entities/services/{serviceId}/plugins/ \
--header "accept: application/json" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer $KONNECT_TOKEN" \
--data '
{
"name": "post-function",
"config": {
"access": [
"ngx.var.upstream_x_forwarded_host=nil"
]
}
}
'
Make sure to replace the following placeholders with your own values:
-
region: Geographic region where your Kong Konnect is hosted and operates. -
controlPlaneId: Theidof the control plane. -
KONNECT_TOKEN: Your Personal Access Token (PAT) associated with your Konnect account. -
serviceId: Theidof the service the plugin configuration will target.
See the Konnect API reference to learn about region-specific URLs and personal access tokens.
echo "
apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
name: post-function
namespace: kong
annotations:
kubernetes.io/ingress.class: kong
config:
access:
- ngx.var.upstream_x_forwarded_host=nil
plugin: post-function
" | kubectl apply -f -
Next, apply the KongPlugin resource by annotating the service resource:
kubectl annotate -n kong service SERVICE_NAME konghq.com/plugins=post-function
Prerequisite: Configure your Personal Access Token
terraform {
required_providers {
konnect = {
source = "kong/konnect"
}
}
}
provider "konnect" {
personal_access_token = "$KONNECT_TOKEN"
server_url = "https://us.api.konghq.com/"
}
Add the following to your Terraform configuration to create a Konnect Gateway Plugin:
resource "konnect_gateway_plugin_post_function" "my_post_function" {
enabled = true
config = {
access = ["ngx.var.upstream_x_forwarded_host=nil"]
}
control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
service = {
id = konnect_gateway_service.my_service.id
}
}
Add this section to your declarative configuration file:
_format_version: "3.0"
plugins:
- name: post-function
route: routeName|Id
config:
access:
- ngx.var.upstream_x_forwarded_host=nil
Make sure to replace the following placeholders with your own values:
-
routeName|Id: Theidornameof the route the plugin configuration will target.
Make the following request:
curl -i -X POST http://localhost:8001/routes/{routeName|Id}/plugins/ \
--header "Accept: application/json" \
--header "Content-Type: application/json" \
--data '
{
"name": "post-function",
"config": {
"access": [
"ngx.var.upstream_x_forwarded_host=nil"
]
}
}
'
Make sure to replace the following placeholders with your own values:
-
routeName|Id: Theidornameof the route the plugin configuration will target.
Make the following request:
curl -X POST https://{region}.api.konghq.com/v2/control-planes/{controlPlaneId}/core-entities/routes/{routeId}/plugins/ \
--header "accept: application/json" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer $KONNECT_TOKEN" \
--data '
{
"name": "post-function",
"config": {
"access": [
"ngx.var.upstream_x_forwarded_host=nil"
]
}
}
'
Make sure to replace the following placeholders with your own values:
-
region: Geographic region where your Kong Konnect is hosted and operates. -
controlPlaneId: Theidof the control plane. -
KONNECT_TOKEN: Your Personal Access Token (PAT) associated with your Konnect account. -
routeId: Theidof the route the plugin configuration will target.
See the Konnect API reference to learn about region-specific URLs and personal access tokens.
echo "
apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
name: post-function
namespace: kong
annotations:
kubernetes.io/ingress.class: kong
config:
access:
- ngx.var.upstream_x_forwarded_host=nil
plugin: post-function
" | kubectl apply -f -
Next, apply the KongPlugin resource by annotating the httproute or ingress resource:
kubectl annotate -n kong httproute konghq.com/plugins=post-function
kubectl annotate -n kong ingress konghq.com/plugins=post-function
Prerequisite: Configure your Personal Access Token
terraform {
required_providers {
konnect = {
source = "kong/konnect"
}
}
}
provider "konnect" {
personal_access_token = "$KONNECT_TOKEN"
server_url = "https://us.api.konghq.com/"
}
Add the following to your Terraform configuration to create a Konnect Gateway Plugin:
resource "konnect_gateway_plugin_post_function" "my_post_function" {
enabled = true
config = {
access = ["ngx.var.upstream_x_forwarded_host=nil"]
}
control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
route = {
id = konnect_gateway_route.my_route.id
}
}