redirection in django

In my home page i have a profile pic on cha开发者_开发问答nging the profile pic i update the DB and redirevt the page to /home . But now when i redirect the old picture remains the same till refresh button is hit.Ami doing anything wrong here

This is in the python code

 return HttpResponseRedirect('/home')

This is in the base html page in /home

   <img src="{{photo}}" ></img>

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Maybe the profile picture is cached by the browser. There are multiple ways to avoid it:

• disable caching for the by changing the response headers for it. This is a bad idea for production because the picture would never be cached, so every page-request would fetch the picture, which massively increases the traffic

• change the filename of the photo when it is update. You could i.e. use a hash of the content or something like SHA1(userid + timestamp of upload)

• use a HTTP ETag in the response header of the picture

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There's a trick I read that consists in writing something like:

<img src="{{photo}}?version={{version}}"></img>

Where version is a new version number that you increase when your file is updated (you could alternatively use {{photo.file}} and {{photo.version}}). This way the URL will be different and the browser will not used the cached version.