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  • Welcome
  • Landing in Transparent Edge
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    • Basics concepts
      • Glosary
        • API
        • Brotli Compression
        • Cache-Control
        • Cache key
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        • Cloud Computing
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        • Virtual Machine
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      • Let's start at the beginning
      • Things to consider
      • Houston, we have a problem
      • HTTP, How does it work?
      • Invalidating methods
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      • Log formats
      • Predefined headers
      • Default headers
        • geo_country_code
        • X-Device
        • Vary
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      • Forcing No-Cache
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        • Transparent Edge’s IP addresses
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        • Protection against origin failures
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        • Caching static vs. dynamic objects
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        • Initial configuration
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  • Configuration
    • VCL Reference
      • Default Functions
      • VCL Objects
      • Callable Functions
      • Security restrictions
      • Varnish book
    • Network Access Control List
      • Initial configuration
      • Auto generated lists
      • Manage lists via API
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      • Quality adjustment
      • Cache timing allocation for transformed images
      • Conversion to grayscale
      • Conversion to WebP
      • Blurring
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      • Definition of the maximum size (content-length)
    • Transcoding
      • Relaunch or requeue jobs
      • Create a transcode job
      • Get job information
      • Dashboard usage
    • OpenAPI de TransparentCDN
  • Security
    • HTTPS
    • Blocking User-Agent
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      • Configuration
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    • Under attack mode
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  • Integrations
    • Wordpress plugin
    • Google Cloud Platform
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  • GUIDES AND TUTORIALS
    • How to do things
    • Edge Computing
      • ESI Tags
    • Acting on the Query String
    • Working with cookies
    • Making decisions based on HTTP headers
    • Web Application Gateway
    • Configure your servers to send cache headers
    • Caching a version per device
    • True-Client-IP in the origin
    • A/B Testing
    • Routing traffic to different backends
    • JSON Web Tokens
    • Debug codes
    • Streaming logs
    • API
      • Authentication
      • Invalidation
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  1. Configuration
  2. VCL Reference

VCL Objects

In VCL, there are different types of objects that you need to know. These objects can be accessed and modified from the VCL configuration.

  • req. It is the request object. It is mainly accessed from the vcl_recv function. When Varnish receives the request, this object is created and accessible to be accessed.

  • bereq. It is the object sent to the backend. It is created just before sending the object to the backend or origin. It is based on the req object.

  • beresp. It is the backend response. It contains the headers of the backend's response to Transparent CDN. If you want to modify them, this object is accessible from the vcl_backend_response function.

  • resp. It is the HTTP response just before being sent to the client. You can modify this object in the vcl_deliver function.

  • obj. It is a read-only object and represents the object stored in the cache.

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Last updated 1 year ago

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