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The @HeaderParam annotation allows you to map a request HTTP header to your method invocation.
GET /books?num=5
@GET
public String getBooks(@HeaderParam("From") String from) {
...
}
Like PathParam, your parameter type can be an String, primitive, or class that has a String constructor or static valueOf() method. For example, MediaType has a valueOf() method and you could do:
@PUT
public void put(@HeaderParam("Content-Type") MediaType contentType, ...)