Request Callout: Dynamically change the request URL - Plugin

Dynamically change the request URLv3.10+

Configure the plugin to send a request to a different URL based on a header value.

In this example, we’re expecting the client to provide a x-custom-header header with a value to append to the specified URL.

You can use the by_lua field to dynamically modify any of the request parameters under config.callouts.request for a particular callout.

Environment variables

API_URL: The API endpoint to use to request a token.

Set up the plugin

Add this section to your declarative configuration file:

_format_version: "3.0"
plugins:
  - name: request-callout
    config:
      callouts:
      - name: call
        request:
          url: ${{ env "DECK_API_URL" }}
          method: GET
          by_lua: kong.ctx.shared.callouts.call.request.params.url = "http://httpbin.org/"..
            (kong.request.get_header("x-custom-header") or "")

Make the following request:

curl -i -X POST http://localhost:8001/plugins/ \
    --header "Accept: application/json" \
    --header "Content-Type: application/json" \
    --data '
    {
      "name": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

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 $KONNECT_TOKEN" \
    --data '
    {
      "name": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

region: Geographic region where your Kong Konnect is hosted and operates.
controlPlaneId: The id of 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: request-callout
  namespace: kong
  annotations:
    kubernetes.io/ingress.class: kong
  labels:
    global: 'true'
config:
  callouts:
  - name: call
    request:
      url: '$API_URL'
      method: GET
      by_lua: kong.ctx.shared.callouts.call.request.params.url = 'http://httpbin.org/'..
        (kong.request.get_header('x-custom-header') or '')
plugin: request-callout
" | 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_request_callout" "my_request_callout" {
  enabled = true

  config = {
    callouts = [
      {
        name = "call"

        request = {
          url = var.api_url
          method = "GET"
          by_lua = "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
        }
      }    ]
  }

  control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
}

This example requires the following variables to be added to your manifest. You can specify values at runtime by setting TF_VAR_name=value.

variable "api_url" {
  type = string
}

Add this section to your declarative configuration file:

_format_version: "3.0"
plugins:
  - name: request-callout
    service: serviceName|Id
    config:
      callouts:
      - name: call
        request:
          url: ${{ env "DECK_API_URL" }}
          method: GET
          by_lua: kong.ctx.shared.callouts.call.request.params.url = "http://httpbin.org/"..
            (kong.request.get_header("x-custom-header") or "")

Make sure to replace the following placeholders with your own values:

serviceName|Id: The id or name of 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": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

serviceName|Id: The id or name of 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 $KONNECT_TOKEN" \
    --data '
    {
      "name": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

region: Geographic region where your Kong Konnect is hosted and operates.
controlPlaneId: The id of the control plane.
KONNECT_TOKEN: Your Personal Access Token (PAT) associated with your Konnect account.
serviceId: The id of 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: request-callout
  namespace: kong
  annotations:
    kubernetes.io/ingress.class: kong
config:
  callouts:
  - name: call
    request:
      url: '$API_URL'
      method: GET
      by_lua: kong.ctx.shared.callouts.call.request.params.url = 'http://httpbin.org/'..
        (kong.request.get_header('x-custom-header') or '')
plugin: request-callout
" | kubectl apply -f -

Next, apply the KongPlugin resource by annotating the service resource:

kubectl annotate -n kong service SERVICE_NAME konghq.com/plugins=request-callout

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_request_callout" "my_request_callout" {
  enabled = true

  config = {
    callouts = [
      {
        name = "call"

        request = {
          url = var.api_url
          method = "GET"
          by_lua = "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
        }
      }    ]
  }

  control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
  service = {
    id = konnect_gateway_service.my_service.id
  }
}

This example requires the following variables to be added to your manifest. You can specify values at runtime by setting TF_VAR_name=value.

variable "api_url" {
  type = string
}

Add this section to your declarative configuration file:

_format_version: "3.0"
plugins:
  - name: request-callout
    route: routeName|Id
    config:
      callouts:
      - name: call
        request:
          url: ${{ env "DECK_API_URL" }}
          method: GET
          by_lua: kong.ctx.shared.callouts.call.request.params.url = "http://httpbin.org/"..
            (kong.request.get_header("x-custom-header") or "")

Make sure to replace the following placeholders with your own values:

routeName|Id: The id or name of 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": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

routeName|Id: The id or name of 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 $KONNECT_TOKEN" \
    --data '
    {
      "name": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

region: Geographic region where your Kong Konnect is hosted and operates.
controlPlaneId: The id of the control plane.
KONNECT_TOKEN: Your Personal Access Token (PAT) associated with your Konnect account.
routeId: The id of 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: request-callout
  namespace: kong
  annotations:
    kubernetes.io/ingress.class: kong
config:
  callouts:
  - name: call
    request:
      url: '$API_URL'
      method: GET
      by_lua: kong.ctx.shared.callouts.call.request.params.url = 'http://httpbin.org/'..
        (kong.request.get_header('x-custom-header') or '')
plugin: request-callout
" | kubectl apply -f -

Next, apply the KongPlugin resource by annotating the httproute or ingress resource:

kubectl annotate -n kong httproute  konghq.com/plugins=request-callout

kubectl annotate -n kong ingress  konghq.com/plugins=request-callout

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_request_callout" "my_request_callout" {
  enabled = true

  config = {
    callouts = [
      {
        name = "call"

        request = {
          url = var.api_url
          method = "GET"
          by_lua = "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
        }
      }    ]
  }

  control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
  route = {
    id = konnect_gateway_route.my_route.id
  }
}

This example requires the following variables to be added to your manifest. You can specify values at runtime by setting TF_VAR_name=value.

variable "api_url" {
  type = string
}

Add this section to your declarative configuration file:

_format_version: "3.0"
plugins:
  - name: request-callout
    consumer: consumerName|Id
    config:
      callouts:
      - name: call
        request:
          url: ${{ env "DECK_API_URL" }}
          method: GET
          by_lua: kong.ctx.shared.callouts.call.request.params.url = "http://httpbin.org/"..
            (kong.request.get_header("x-custom-header") or "")

Make sure to replace the following placeholders with your own values:

consumerName|Id: The id or name of the consumer the plugin configuration will target.

Make the following request:

curl -i -X POST http://localhost:8001/consumers/{consumerName|Id}/plugins/ \
    --header "Accept: application/json" \
    --header "Content-Type: application/json" \
    --data '
    {
      "name": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

consumerName|Id: The id or name of the consumer the plugin configuration will target.

Make the following request:

curl -X POST https://{region}.api.konghq.com/v2/control-planes/{controlPlaneId}/core-entities/consumers/{consumerId}/plugins/ \
    --header "accept: application/json" \
    --header "Content-Type: application/json" \
    --header "Authorization: Bearer $KONNECT_TOKEN" \
    --data '
    {
      "name": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

region: Geographic region where your Kong Konnect is hosted and operates.
controlPlaneId: The id of the control plane.
KONNECT_TOKEN: Your Personal Access Token (PAT) associated with your Konnect account.
consumerId: The id of the consumer 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: request-callout
  namespace: kong
  annotations:
    kubernetes.io/ingress.class: kong
config:
  callouts:
  - name: call
    request:
      url: '$API_URL'
      method: GET
      by_lua: kong.ctx.shared.callouts.call.request.params.url = 'http://httpbin.org/'..
        (kong.request.get_header('x-custom-header') or '')
plugin: request-callout
" | kubectl apply -f -

Next, apply the KongPlugin resource by annotating the KongConsumer resource:

kubectl annotate -n kong  CONSUMER_NAME konghq.com/plugins=request-callout

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_request_callout" "my_request_callout" {
  enabled = true

  config = {
    callouts = [
      {
        name = "call"

        request = {
          url = var.api_url
          method = "GET"
          by_lua = "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
        }
      }    ]
  }

  control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
  consumer = {
    id = konnect_gateway_consumer.my_consumer.id
  }
}

This example requires the following variables to be added to your manifest. You can specify values at runtime by setting TF_VAR_name=value.

variable "api_url" {
  type = string
}

Add this section to your declarative configuration file:

_format_version: "3.0"
plugins:
  - name: request-callout
    consumer_group: consumerGroupName|Id
    config:
      callouts:
      - name: call
        request:
          url: ${{ env "DECK_API_URL" }}
          method: GET
          by_lua: kong.ctx.shared.callouts.call.request.params.url = "http://httpbin.org/"..
            (kong.request.get_header("x-custom-header") or "")

Make sure to replace the following placeholders with your own values:

consumerGroupName|Id: The id or name of the consumer group the plugin configuration will target.

Make the following request:

curl -i -X POST http://localhost:8001/consumer_groups/{consumerGroupName|Id}/plugins/ \
    --header "Accept: application/json" \
    --header "Content-Type: application/json" \
    --data '
    {
      "name": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

consumerGroupName|Id: The id or name of the consumer group the plugin configuration will target.

Make the following request:

curl -X POST https://{region}.api.konghq.com/v2/control-planes/{controlPlaneId}/core-entities/consumer_groups/{consumerGroupId}/plugins/ \
    --header "accept: application/json" \
    --header "Content-Type: application/json" \
    --header "Authorization: Bearer $KONNECT_TOKEN" \
    --data '
    {
      "name": "request-callout",
      "config": {
        "callouts": [
          {
            "name": "call",
            "request": {
              "url": "'$API_URL'",
              "method": "GET",
              "by_lua": "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
            }
          }
        ]
      }
    }
    '

Make sure to replace the following placeholders with your own values:

region: Geographic region where your Kong Konnect is hosted and operates.
controlPlaneId: The id of the control plane.
KONNECT_TOKEN: Your Personal Access Token (PAT) associated with your Konnect account.
consumerGroupId: The id of the consumer group 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: request-callout
  namespace: kong
  annotations:
    kubernetes.io/ingress.class: kong
config:
  callouts:
  - name: call
    request:
      url: '$API_URL'
      method: GET
      by_lua: kong.ctx.shared.callouts.call.request.params.url = 'http://httpbin.org/'..
        (kong.request.get_header('x-custom-header') or '')
plugin: request-callout
" | kubectl apply -f -

Next, apply the KongPlugin resource by annotating the KongConsumerGroup resource:

kubectl annotate -n kong  CONSUMERGROUP_NAME konghq.com/plugins=request-callout

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_request_callout" "my_request_callout" {
  enabled = true

  config = {
    callouts = [
      {
        name = "call"

        request = {
          url = var.api_url
          method = "GET"
          by_lua = "kong.ctx.shared.callouts.call.request.params.url = \"http://httpbin.org/\".. (kong.request.get_header(\"x-custom-header\") or \"\")"
        }
      }    ]
  }

  control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
  consumer_group = {
    id = konnect_gateway_consumer_group.my_consumer_group.id
  }
}

This example requires the following variables to be added to your manifest. You can specify values at runtime by setting TF_VAR_name=value.

variable "api_url" {
  type = string
}

Request Callout

Dynamically change the request URLv3.10+

Environment variables

Set up the plugin

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