Cache

Cache Control

1. Cache

   proxy.config.http.cache.http
   

   Set to 0: Test if Traffic Server disables caching HTTP requests.

   Set to 1: Test if Traffic Server enables caching HTTP requests.

Caching HTTP Objects

1. Client Directives

   By default, Traffic Server does not cache objects with the following request headers:

   • Authorization
   • Cache-Control: no-store
   • Cache-Control: no-cache
   • Cookie (for text objects)

   We need to test the following scenarios:

   • Test if Traffic Server does not cache objects with the above request headers.
   • Test if Traffic Server can ignore client no-cache headers.
   • Test if Traffic Server caches cookied content.

2. Origin Server Directives

By default, Traffic Server does not cache objects with the following response headers:

• Cache-Control: no-store
• Cache-Control: private
• WWW-Authenticate
• Set-Cookie
• Cache-Control: no-cache
• Expires

We need to test the following scenarios:

• Test if Traffic Server does not cache objects with the above response headers.
• Test if Traffic Server can ignore WWW-Authenticate headers.
• Test if Traffic Server can ignore server no-cache headers.

Heuristic Expiration

proxy.config.http.cache.heuristic_min_lifetime
proxy.config.http.cache.heuristic_max_lifetime
proxy.config.http.cache.heuristic_lm_factor

Test if the heuristic minimum lifetime, maximum lifetime and aging factor take effect.

proxy.config.http.cache.fuzz.time
proxy.config.http.cache.fuzz.probability
proxy.config.http.cache.fuzz.min_time

Test if the fuzz time, probability and minimum time take effect.

Dynamic Content & Content Negotiation

proxy.config.http.cache.vary_default_text

Test if Traffic Server varies on the specified header for text documents.

proxy.config.http.cache.vary_default_images

Test if Traffic Server varies on the specified header for images.

proxy.config.http.cache.vary_default_other

Test if Traffic Server varies on the specified header for anything other than text and images.

Negative Response Caching

proxy.config.http.negative_caching_enabled

Set to 0: Test if Traffic Server does not cache negative responses when a requested page does not exist.

Set to 1: Test if Traffic Server caches negative responses when a requested page does not exist.

proxy.config.http.negative_caching_lifetime

Set to N: Test if Traffic Server keeps the negative responses valid in cache for N seconds.

Negative Revalidate

PUSH

proxy.config.http.push_method_enabled

Set to 1: Test if Traffic Server allows to deliver content directly to the cache without a user request via PUSH method.