VMODs

Varnish is extendable by the way of Varnish Modules (VMODs). They are imported and called from you VCL to offer a larger set of capabilities to your setup.

The following list contains the available VMODs we package and support in Varnish Enterprise:

Accept
Accounting
ACL (aclplus)
ActiveDNS
Akamai Connector
AWS VCL
Body Access & Transformation (xbody)
Bodyaccess
Brotli
Cookie Plus (cookieplus)
DeviceAtlas
Digest
Dynamic backends (goto)
Edgestash
File
Format
Geolocation (geoip/mmdb)
Header Manipulation (headerplus)
HTTP communication (http)
Image
JSON parsing (json)
JWT
Key value storage (kvstore)
Least connections director (leastconn)
Module to control the built-in HTTP2 transport (h2)
MSE control (mse)
Probe Proxy
ProxyV2 TLV Attribute Extraction (proxy)
Pseudo Random Number Generator
Purge (purge/softpurge)
Real-time Status (rtstatus)
Reverse DNS (resolver)
Rewrite
S3 VMOD
Session
Slicer
SQLite3
Stale
Standard (std)
Stat (Prometheus)
Strings (str)
Synthetic backends (synthbackend)
Tag-based invalidation (Ykey/Xkey)
TCP configuration (tcp)
TLS
Total Encryption (crypto)
Unified director object (udo)
Uniform Resource Identifier (uri)
Unix Socket Utilities (unix)
URL Plus (urlplus)
Utils
Vsthrottle
Edgestash 4
Dynamic backends (goto)
Header manipulation (header)
Key value storage (kvstore)

Besides the VMODs presented here, there are many open source VMODs. An ongoing effort to describe them can be found at https://varnish-cache.org/vmods/.