Spring Framework
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[[webflux-client-attributes]]
= Attributes
You can add attributes to a request. This is convenient if you want to pass information
through the filter chain and influence the behavior of filters for a given request.
For example:
[tabs]
======
Java::
+
[source,java,indent=0,subs="verbatim,quotes",role="primary"]
----
WebClient client = WebClient.builder()
.filter((request, next) -> {
Optional<Object> usr = request.attribute("myAttribute");
// ...
})
.build();
client.get().uri("https://example.org/")
.attribute("myAttribute", "...")
.retrieve()
.bodyToMono(Void.class);
}
----
Kotlin::
+
[source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
----
val client = WebClient.builder()
.filter { request, _ ->
val usr = request.attributes()["myAttribute"];
// ...
}
.build()
client.get().uri("https://example.org/")
.attribute("myAttribute", "...")
.retrieve()
.awaitBody<Unit>()
----
======
Note that you can configure a `defaultRequest` callback globally at the
`WebClient.Builder` level which lets you insert attributes into all requests,
which could be used for example in a Spring MVC application to populate
request attributes based on `ThreadLocal` data.