プラグイン

概要

Apache Traffic Server™ の重要な機能の一つはモジュール性です。コアに不要な機能はコアの中には存在しません。これは良いことです。なぜならば、それはコアが常に提供するキャッシュとプロキシーに集中することにより、速い状態を保つことができるからです。

他の全ての機能はプラグインに移すことができます。安定した C API を使うことにより、コアに触ること無く、誰でも独自の機能を実装することができます。

安定したプラグイン

安定的なプラグインです。これらは Traffic Server のリリースにデフォルトでインストールされれています。

AuthProxy: Delegates the authorization decision of a request to an external HTTP service.
Background Fetch: Proactively fetch content from Origin in a way that it will fill the object into cache.
Cache Key and Parent Selection URL Manipulation: Allows some common cache key or parent selection URL manipulations based on various HTTP request elements.
Cache Promotion Policies: Allows for control over which assets should be written to cache, or not.
Cache Range Requests: Cache ranges by adding the range request header to the cache key.
Combo Handler: Provides an intelligent way to combine multiple URLs into a single URL, and have Apache Traffic Server combine the components into one response.
Configuration Remap: Override configuration directives on a per-rule basis.
ESI: Implements the Edge Side Includes (ESI) specification.
Escalate: Escalate: when the origin returns specific status codes, retry the request at a secondary origin (failover/fail-action)
Generator: Generate arbitrary response data.
Compress: Compress or deflate cache responses.
Header Rewrite: Modify requests and responses based on incoming and outgoing headers and other transaction attributes.
Health Checks: Define service health check links.
HTTP Stats: A remap-based plugin that provides an HTTP interface to all Traffic Server statistics.
JA3 Fingerprint: Calculates JA3 Fingerprints for incoming SSL traffic.
Lua: Allows plugins to be written in Lua instead of C code.
Origin Server Authentication: Support for Amazon S3 and Google Cloud Services authentication features.
Regex Remap: Configure remapping rules using regular expressions.
Regex Revalidate: Configurable rules for forcing cache object revalidations using regular expressions.
Remap Stats: This global plugin adds remap stats to the stats.
Static Hit: Serve static content from proxy's local filesystem.
Stats over HTTP: Provide an HTTP interface to all Traffic Server statistics.
TCPInfo: Log TCP metrics at various points of the HTTP processing pipeline.
Traffic Dump: Dumps traffic data into a JSON format file which can be used to replay traffic.
WebP Transform: Converts jpeg and png images to webp format.
XDebug: Allows HTTP clients to debug the operation of the Traffic Server cache using the X-Debug header.

実験的なプラグイン

Plugins that are considered experimental are located in the plugins/experimental directory of the Traffic Server source tree. Experimental plugins can be compiled by passing the -DBUILD_EXPERIMENTAL_PLUGINS=ON` variable to cmake command when building.

Access Control: Access control plugin that handles various access control use-cases.
Block Errors: Blocks or downgrades new connections when the server receives too many errors from an IP address.
Certifier: Manages and/or generates certificates for incoming HTTPS requests.
Cert Reporting Tool: Examines and logs information on loaded certificates.
Cookie Remap: Makes decisions on destinations based on cookies.
FQ Pacing: FQ Pacing: Rate Limit TCP connections using Linux's Fair Queuing queue discipline
GeoIP ACL: Deny or allow requests based on the source IP geo-location.
Header Frequency: Count the frequency of headers.
ICAP: Pass response data to external server for further processing using the ICAP protocol.
MaxMind ACL: ACL based on the maxmind geo databases (GeoIP2 mmdb and libmaxminddb)
Memcache: Implements the memcache protocol for cache contents.
Money Trace: Allows Trafficserver to participate in a distributed tracing system based upon the Comcast Money library.
MP4: MP4 streaming media.
Multiplexer: Multiplex inbound requests to multiple upstream destinations. This is useful for requests that are beacons or other metric gathering requests, to report to multiple upstreams. Alternatively this can be used to do A/B testing by sending a duplicated slice of inbound production traffic to experimental upstreams.
OpenTelemetry Tracer: Allows Trafficserver to participate in OpenTelemetry distributed tracing system
Prefetch: Pre-fetch objects based on the requested URL path pattern.
Rate Limit: Simple transaction rate limiting.
Real IP: Provides real client's IP address.
Remap Purge: This remap plugin allows the administrator to easily setup remotely controlled PURGE for the content of an entire remap rule.
URI Signing: Adds support for verifying URL signatures for incoming requests to either deny or redirect access, implementing the IETF URI Signing draft RFC.
Legacy Signed URLs: Adds support for verifying URL signatures for incoming requests to either deny or redirect access.

注釈

URL Sig is old and unlikely to be standardized. Prefer URI Signing.
Slice: Slice full file or range based requests into deterministic chunks, allowing large files to be spread across multiple cache stripes. Allows arbitrary range requests to be satisfied by stitching these chunks together.
SSL Headers: Populate request headers with SSL session information.
Stale Response: Implements handling of the stale-while-revalidate and stale-if-error Cache-Control directive extensions.
STEK Share: Coordinates STEK (Session Ticket Encryption Key) between ATS instances running in a group.
System Stats: Inserts system statistics in to the stats list
Wasm: Allows WebAssembly/Wasm (proxy-wasm) module to be used as ATS Plugin.
Transaction Box(TxnBox): Transaction Box, or TxnBox, is an Apache Traffic Server plugin to manipulate transactions.