src/targets/java/asynchttp/fixtures/headers.java
AsyncHttpClient client = new DefaultAsyncHttpClient();
client.prepare("GET", "http://mockbin.com/har")
.setHeader("accept", "application/json")
.setHeader("x-foo", "Bar")
.setHeader("quoted-value", "\"quoted\" 'string'")
.execute()
.toCompletableFuture()
.thenAccept(System.out::println)
.join();
client.close();