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Myra Online Help Updated · 21 Aug 2026

Add Cache Rule / Edit Cache Rule dialog

dialog_add_cache_EN

Add cache rule dialog

In the Add cache rule and Edit cache rule dialogs, you can add new cache rules or edit existing cache rules, depending on the selected option.

The following options are available in the dialog:

Name Definition
SELECT TYPE Defines which part of the path should be cached.
The following options are available:
  • Exact: The path to be cached matches the path or regular expression you entered in the Path text field exactly. No subpaths are taken into account.
  • Prefix: All paths that match the path or regular expression in the Path text field or represent the subpaths of this path are cached.
  • Suffix: All objects that match or end with the regular expression entered in the Field text field are cached. You can use this setting for file types, among other things. Enter the file extension.
ExampleAll JPG files on your website are cached if Suffix and the .jpgvalue under Path match.
PATH Defines one or more paths that should be cached.
You can use regular expressions to map different paths.NoteOnly elements that deliver one of the following response codes are cached: 200 – Request was successful 300 – The requested resource exists in multiple variants 301 – A permanent redirect of a requested resource to a new URL 302 – A temporary redirectNoteThe hierarchy of the cache settings is as follows: Specific settings take precedence over general settings. Cache settings for individual subdomains take precedence over the general settings for all subdomains.Example/images/static/ takes priority over /images/ and can have different cache settings than the /images/ parent folder.
Time to live Defines the time period in seconds during which files are kept in the cache. During this time, no request must be made to the origin server for the affected files.NoteIf 0 like origin server is selected as the lifetime, Myra uses the cache control header of your infrastructure for caching.NoteA value of -1 disables file caching.
TIME TO LIVE (HTTP 404) The time period in seconds during which files with an origin response HTTP code 404 are kept in the cache.NoteIf 0 like origin server is selected as the lifetime, Myra uses the cache control header of your infrastructure for caching.NoteA value of -1 disables file caching.
Sort Defines a number for positioning the entry in the sequence of all entries.
ENFORCE TIME TO LIVE Defines the validity period of the cached object (Cache-Control: max-age) in the backend, regardless of the response sent by the client infrastructure, in order to enforce the validity period.NoteWhen ENFORCE TIME TO LIVE option from Myra is enabled, the lifetime of cache entries in the browser is controlled by the value specified in the TIME TO LIVE field. The following cases are possible: If your infrastructure does not provide a Cache-Control header, Myra sets the Cache-Control header with the max-age value itself and passes it on to the client. The value of max-age corresponds to the value defined in the TIME TO LIVE field. If your infrastructure already provides a value for max-age, Myra will override it with the value stored in the TIME TO LIVE field.NoteEnabling ENFORCE TIME TO LIVE only takes effect if a value other than 0 is entered in the TIME TO LIVE field.NoteForcing the cache TTL is not applied in case of a no-cache rule, such as cache control: (no-store\|no-cache\|private) or cache control: max-age=0.
STATUS Defines whether the entry is enabled or disabled.
COMMENT Defines a custom description of the entry.
Save The button adds a new entry or changes it.
Cancel The button closes the window without adding a new entry or changing an entry.

Example

  • ■ All files located under the /example path exactly are cached for 2 minutes.
Name Definition
Exact /example 2 minutes
  • ■ All files with the formats .pdf, .png, .html, or .json that exist under any of the paths of the domain are cached for one week.
Name Definition
Ends with .pdf .png
  • ■ The favicon is cached for one week. All other files that are also in /resource/ are still not taken into account.
Name Definition
Exact /resource/favicon.ico 1 week
  • ■ All of the files of the domain are cached for 15 minutes, except.jpg files.
Name Definition
Starts with / 15 minutes
Ends with .jpg -1

Note

Whether a resource was delivered from the cache from Myra can be seen in the X-CDN header. This has the value1if the resource comes from the cache. An X-CDN header with the value 2 means that a stale object was delivered. If the resource is delivered directly from the origin server, the X-CDN header is not attached.

Note

With content management systems, caching can cause problems with non-static pages, for example logging into the admin panel.

This can be solved as follows: Set the caching settings so that the admin areas adopt the cache settings from your infrastructure.

Note

For more information about caching, see Section Set up Myra CDN.