Response headers and caching

[Petervdburg]

Hi, my very basic server is serving some html (rendered template using microdot_utemplate) and a background image.

The image isnt caching in my browser (Chrome), and my reading suggests I put some headers into my response such as Cache-Control: max-age=31536000 but I have no idea how. I couldn't find any examples in the docs or examples.

Some code snippets:
app = Microdot()
Response.default_content_type = 'text/html'
@app.get('/water')
async def spa_temps(request):
return render_template('water7.html',temp = request.g.pool_temp)
Ideas?
Thanks

[miguelgrinberg]

The docs that apply to this are here: https://microdot.readthedocs.io/en/latest/intro.html#the-three-parts-of-a-response

How are you serving your image? Because the example that you posted is for your HTML, but you want to cache the image.

[miguelgrinberg]

I just realized that if you are using send_file() to serve your image, it wasn't easy to include a Cache-Control header. I have now added a max_age argument to send_file() that you can use to easily indicate what the cache duration is.

@app.get('/image.jpg')
def image(request):
    return send_file('/static/image.jpg', max_age=31536000)

Hope this helps!

[Petervdburg]

Thanks for the quick response, Miguel and bang on. Apologies for not explaining things properly. It is the 'static' images associated with the html. Your patch now returns the 'Cache-Control: max-age=xxxx' in the Response and I see the browser retrieving the image from memory (now taking uSec vs seconds).