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The Header Route Predicate Factory

The header route predicate factory takes two parameters, the header name and a regular expression. This predicate matches with a header that has the given name whose value matches the regular expression. The following example configures a header route predicate:

Example 1. application.yml

spring:
  cloud:
    gateway:
      routes:
      - id: header_route
        uri: https://example.org
        predicates:
        - Header=X-Request-Id, \d+

This route matches if the request has a header named X-Request-Id whose value matches the \d+ regular expression (that is, it has a value of one or more digits).