zh-translation: /faq/mixer/header-rules.md istio#1415

content/zh/faq/mixer/header-rules.md

@@ -1,18 +1,12 @@
 ---
-title: Why does my rule not match?
+title: 为什么我的规则无法匹配?
 weight: 50
 ---
 
-Mixer rules must be valid to be applied at runtime. That means the match
-conditions are well-defined expressions in the
-[language](/zh/docs/reference/config/policy-and-telemetry/expression-language/), the attributes
-are declared in an [attribute
-manifest](/zh/docs/reference/config/policy-and-telemetry/attribute-vocabulary/), and rules have
-no dangling references to handlers and instances.
+Mixer 的规则必须在运行时验证。这意味着匹配条件的必须是 [语言](/zh/docs/reference/config/policy-and-telemetry/expression-language/) 中明确定义的表达式，
+属性是 [属性清单](/zh/docs/reference/config/policy-and-telemetry/attribute-vocabulary/) 中声明过的，
+并且规则所指向的 handler 和 instance 也必须存在。
 
-The attribute values are typically normalized before evaluating rules on
-them. For example, HTTP headers have lowercase keys in `request.headers` and
-`response.headers` attributes. An expression
-`request.headers["X-Forwarded-Proto"] == "http"` does not match any request
-even though HTTP headers are case-insensitive. Instead, use an expression
-`request.headers["x-forwarded-proto"] == "http"`.
+在执行规则之前，属性值通常会被标准化。比如，在 `request.headers` 和 `response.headers` 属性中，HTTP 头的键是小写的。
+表达式 `request.headers["X-Forwarded-Proto"] == "http"` 不会匹配任何请求，即使 HTTP 头部是不区分大小写的。
+相反，应该使用这样的表达式 `request.headers["x-forwarded-proto"] == "http"`。