First print something before sending a file to the user

[nikos.at....@gmail.com]

As it is now the following code cannot return a tuple, with 2 elements, 1st one being a astring and then a response method.

@app.route( '/file', methods=['POST'] )
def file():

    pdata = ''
    pdata = pdata + '''<img src="/static/img/arrow.gif" align="left">'''
    return pdata, send_from_directory( filepath, filename, as_attachment=True )

What is the easiest way to have pdata print some lines before i return afile to the user?

I do NOT wish to create an extra html template just to print some lines.