junit-servers-core/src/main/java/com/github/mjeanroy/junit/servers/client/impl/ning/NingAsyncHttpRequest.java
private void handleHeaders(RequestBuilder builder) {
		for (HttpHeader header : headers.values()) {
			builder.addHeader(header.getName(), header.serializeValues());
		}
	}
private void handleHeaders(RequestBuilder builder) {
		for (HttpHeader header : headers.values()) {
			builder.addHeader(header.getName(), header.serializeValues());
		}
	}
Add request headers.

@param builder The pending HTTP request.
@see RequestBuilder#addHeader(String, String)