Section name in the header

Question

So I'm working on a book, my document type is article and I used fancyhdrto customize my header.

1. I want the section name in the right of the header on even page numbers.
2. I want the subsection name in the left of the header on odd page numbers.

The subsection name appears perfectly fine on the left of the header on odd page numbers. My problem is with the section name that didn't appear at all. Here's what I have on the preamble:

\pagestyle{fancy}
\fancyhf{}
\fancyhead[RO,LE]{\thepage}
\fancyhead[RE]{\leftmark}
\fancyhead[LO]{\rightmark}

Answer 1

Here is a solution with the 'nameref' package.

However, atm there is one major downside: 'currentlabel' refers to titles of a subsection as well as any other section. Means, if you have multiple pages within a section it will use that title for the header - because no subsection was specified. Do you think my answer will help you nevertheless?

EDIT #1:

\documentclass[twoside]{article}
\usepackage{fancyhdr}
\usepackage{nameref}

\makeatletter
\newcommand*{\currentname}{\@currentlabelname}
\makeatother

\fancypagestyle{yourStyle}{
    \fancyhf{}
    \fancyhead[RO,LE]{\thepage}
    \fancyhead[RE]{\leftmark}
%   \fancyhead[LO]{\rightmark}
    \fancyhead[LO]{\MakeUppercase\currentname}
}

\begin{document}
\pagestyle{yourStyle}
\section{First level}
\newpage
\subsection{Second level}
\newpage
...
\newpage
...
\end{document}