1116001 - Save image as... re-downloads the image

Status: RESOLVED DUPLICATE of bug 120809

(Core Graveyard :: File Handling, defect)

Description

[Tim]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:34.0) Gecko/20100101 Firefox/34.0
Build ID: 20141126041045

Steps to reproduce:

I have a website that generates an image in response to a POST request (because one of the parameters is too long for GET). If you browse to that site, the image is displayed correctly in firefox. (Only the image is sent - it isn't embedded in a web page.)

If you then right-click the image and select Save Image As... Firefox re-fetches the image but using a GET, and without sending any parameters, which means that it just saves the error message.


Actual results:

Instead of the image being saved, an error message from my site ("Parameter missing") is saved as output.png. That's really going to confuse people!


Expected results:

Firefox should clearly cache the image file and just copy it when a save is requested, or re-encode the image from memory. Re-downloading it is wasteful, unexpected and impossible in some cases (e.g. when the image comes from a POST - you can't refetch it because POST is often used as shorthand for "changes something on the server").

Comment 1

[Tim]

Chrome behaves correctly by the way.

Comment 2

[Matthias Versen [:Matti]]

>Firefox should clearly cache the image file
That depends if caching is allowed and i don't know if Gecko caches Post requests without additional headers.

>or re-encode the image from memory
You would not get the same file and that means that this is no option.

Comment 3

[[:Aleksej]]

This almost certainly is a duplicate.