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
DeviceAtlas3
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)
MSE4 control (mse4)
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
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/.