static AggregatedHttpRequest of(RequestHeaders headers, HttpData content) {
        requireNonNull(headers, "headers");
        requireNonNull(content, "content");
        return of(headers, content, HttpHeaders.of());
    }
Creates a new HTTP request.

@param headers the HTTP request headers
@param content the content of the request
core/src/main/java/com/linecorp/armeria/common/AggregatedHttpRequest.java