APIM缓存策略中的“policies”

Question

我正在学习Apim策略。在缓存策略中，有许多

Answer 1

我猜你指的是https://docs.microsoft.com/en-us/azure/api-management/api-management-caching-policies#GetFromCache

<cache-lookup vary-by-developer="true | false" vary-by-developer-groups="true | false" caching-type="prefer-external | external | internal" downstream-caching-type="none | private | public" must-revalidate="true | false" allow-private-response-caching="@(expression to evaluate)">
  <vary-by-header>Accept</vary-by-header>
  <!-- should be present in most cases -->
  <vary-by-header>Accept-Charset</vary-by-header>
  <!-- should be present in most cases -->
  <vary-by-header>Authorization</vary-by-header>
  <!-- should be present when allow-private-response-caching is "true"-->
  <vary-by-header>header name</vary-by-header>
  <!-- optional, can repeated several times -->
  <vary-by-query-parameter>parameter name</vary-by-query-parameter>
  <!-- optional, can repeated several times -->
</cache-lookup>

默认情况下，缓存查找将只使用URL路径作为一个引用(缓存键)来查找缓存的项。

但是，如果您还希望根据特定的标头或查询参数改变缓存查找-通过扩展缓存键-您可以使用<vary-by-header>或<vary-by-query-parameter>，以便根据其他标头和/或查询参数对相同的URL路径响应进行缓存。

vary-by-developer或vary-by-developer-groups将使用分配给所使用的订阅键的用户或用户组来扩展缓存键-因此，对于相同的URL路径，响应将根据调用该API操作的人进行缓存。