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stream-applications/functions/function/header-enricher-function
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# Header Enricher Function

This module provides a header enricher function that can be reused and composed in other applications.

## Beans for injection

You can import the `HeaderEnricherFunctionConfiguration` in a Spring Boot application and then inject the following bean.

`headerEnricherFunction`

You can use `headerEnricherFunction` as a qualifier when injecting.

Once injected, you can use the `apply` method of the `Function` to invoke it and get the result.

## Configuration Options

For more information on the various options available, please see link:src/main/java/org/springframework/cloud/fn/header/enricher/HeaderEnricherFunctionProperties.java[HeaderEnricherFunctionProperties.java]

## Tests

See this link:src/test/java/org/springframework/cloud/fn/header/enricher/HeaderEnricherFunctionApplicationTests.java[test suite] for examples of how this function is used.

## Other usage

See this link:../../../applications/processor/header-enricher-processor/README.adoc[README] where this function is used to create a Spring Cloud Stream application.