Proxy Caching Advanced Configuration

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Configuration

This plugin is compatible with DB-less mode.

Compatible protocols

The Proxy Caching Advanced plugin is compatible with the following protocols:

grpc, grpcs, http, https

Parameters

Here's a list of all the parameters which can be used in this plugin's configuration:

• name or plugin

  string required

  The name of the plugin, in this case proxy-cache-advanced.

  • If using the Kong Admin API, Konnect API, declarative configuration, or decK files, the field is name.
  • If using the KongPlugin object in Kubernetes, the field is plugin.

• instance_name

  string

  An optional custom name to identify an instance of the plugin, for example proxy-cache-advanced_my-service.

  The instance name shows up in Kong Manager and in Konnect, so it's useful when running the same plugin in multiple contexts, for example, on multiple services. You can also use it to access a specific plugin instance via the Kong Admin API.

  An instance name must be unique within the following context:

  • Within a workspace for Kong Gateway Enterprise
  • Within a control plane or control plane group for Konnect
  • Globally for Kong Gateway (OSS)

• service.name or service.id

  string

  The name or ID of the service the plugin targets. Set one of these parameters if adding the plugin to a service through the top-level /plugins endpoint. Not required if using /services/{serviceName|Id}/plugins.

• route.name or route.id

  string

  The name or ID of the route the plugin targets. Set one of these parameters if adding the plugin to a route through the top-level /plugins endpoint. Not required if using /routes/{routeName|Id}/plugins.

• consumer.name or consumer.id

  string

  The name or ID of the consumer the plugin targets. Set one of these parameters if adding the plugin to a consumer through the top-level /plugins endpoint. Not required if using /consumers/{consumerName|Id}/plugins.

• enabled

  boolean default: true

  Whether this plugin will be applied.

• config

  record required
  • response_code

    array of type integer required default: 200, 301, 404 len_min: 1

    Upstream response status code considered cacheable. The integers must be a value between 100 and 900.

  • request_method

    array of type string required default: GET, HEAD Must be one of: HEAD, GET, POST, PATCH, PUT

    Downstream request methods considered cacheable. Available options: HEAD, GET, POST, PATCH, PUT.

  • content_type

    array of type string required default: text/plain, application/json

    Upstream response content types considered cacheable. The plugin performs an exact match against each specified value; for example, if the upstream is expected to respond with a application/json; charset=utf-8 content-type, the plugin configuration must contain said value or a Bypass cache status is returned.

  • cache_ttl

    integer default: 300

    TTL in seconds of cache entities.

  • strategy

    string required Must be one of: memory, redis

    The backing data store in which to hold cache entities. Accepted values are: memory and redis.

  • cache_control

    boolean required default: false

    When enabled, respect the Cache-Control behaviors defined in RFC7234.

  • ignore_uri_case

    boolean default: false

    Determines whether to treat URIs as case sensitive. By default, case sensitivity is enabled. If set to true, requests are cached while ignoring case sensitivity in the URI.

  • storage_ttl

    integer

    Number of seconds to keep resources in the storage backend. This value is independent of cache_ttl or resource TTLs defined by Cache-Control behaviors.

  • memory

    record required
    • dictionary_name

      string required default: kong_db_cache

      The name of the shared dictionary in which to hold cache entities when the memory strategy is selected. Note that this dictionary currently must be defined manually in the Kong Nginx template.

  • vary_query_params

    array of type string

    Relevant query parameters considered for the cache key. If undefined, all params are taken into consideration.

  • vary_headers

    array of type string

    Relevant headers considered for the cache key. If undefined, none of the headers are taken into consideration.

  • response_headers

    record required

    Caching related diagnostic headers that should be included in cached responses

    • age

      boolean default: true

    • X-Cache-Status

      boolean default: true

    • X-Cache-Key

      boolean default: true

  • redis

    record required
    • host

      string

      A string representing a host name, such as example.com.

    • port

      integer between: 0 65535

      An integer representing a port number between 0 and 65535, inclusive.

    • timeout

      integer default: 2000 between: 0 2147483646

      An integer representing a timeout in milliseconds. Must be between 0 and 2^31-2.

    • connect_timeout

      integer between: 0 2147483646

      An integer representing a timeout in milliseconds. Must be between 0 and 2^31-2.

    • send_timeout

      integer between: 0 2147483646

      An integer representing a timeout in milliseconds. Must be between 0 and 2^31-2.

    • read_timeout

      integer between: 0 2147483646

      An integer representing a timeout in milliseconds. Must be between 0 and 2^31-2.

    • username

      string referenceable

      Username to use for Redis connections. If undefined, ACL authentication won’t be performed. This requires Redis v6.0.0+. The username cannot be set to default.

    • password

      string referenceable encrypted

      Password to use for Redis connections. If undefined, no AUTH commands are sent to Redis.

    • sentinel_username

      string referenceable

      Sentinel username to authenticate with a Redis Sentinel instance. If undefined, ACL authentication won’t be performed. This requires Redis v6.2.0+.

    • sentinel_password

      string referenceable encrypted

      Sentinel password to authenticate with a Redis Sentinel instance. If undefined, no AUTH commands are sent to Redis Sentinels.

    • database

      integer default: 0

      Database to use for the Redis connection when using the redis strategy

    • keepalive_pool_size

      integer default: 256 between: 1 2147483646

      The size limit for every cosocket connection pool associated with every remote server, per worker process. If neither keepalive_pool_size nor keepalive_backlog is specified, no pool is created. If keepalive_pool_size isn’t specified but keepalive_backlog is specified, then the pool uses the default value. Try to increase (e.g. 512) this value if latency is high or throughput is low.

    • keepalive_backlog

      integer between: 0 2147483646

      Limits the total number of opened connections for a pool. If the connection pool is full, connection queues above the limit go into the backlog queue. If the backlog queue is full, subsequent connect operations fail and return nil. Queued operations (subject to set timeouts) resume once the number of connections in the pool is less than keepalive_pool_size. If latency is high or throughput is low, try increasing this value. Empirically, this value is larger than keepalive_pool_size.

    • sentinel_master

      string

      Sentinel master to use for Redis connections. Defining this value implies using Redis Sentinel.

    • sentinel_role

      string Must be one of: master, slave, any

      Sentinel role to use for Redis connections when the redis strategy is defined. Defining this value implies using Redis Sentinel.

    • sentinel_addresses

      array of type string len_min: 1

      Sentinel addresses to use for Redis connections when the redis strategy is defined. Defining this value implies using Redis Sentinel. Each string element must be a hostname. The minimum length of the array is 1 element.

    • cluster_addresses

      array of type string len_min: 1

      Cluster addresses to use for Redis connections when the redis strategy is defined. Defining this value implies using Redis Cluster. Each string element must be a hostname. The minimum length of the array is 1 element.

    • ssl

      boolean default: false

      If set to true, uses SSL to connect to Redis.

    • ssl_verify

      boolean default: false

      If set to true, verifies the validity of the server SSL certificate. If setting this parameter, also configure lua_ssl_trusted_certificate in kong.conf to specify the CA (or server) certificate used by your Redis server. You may also need to configure lua_ssl_verify_depth accordingly.

    • server_name

      string

      A string representing an SNI (server name indication) value for TLS.

  • bypass_on_err

    boolean default: false

    Unhandled errors while trying to retrieve a cache entry (such as redis down) are resolved with Bypass, with the request going upstream.