For the local proxy, we weren't following redirects.
We remove the CheckRedirect function and use the default
function, which is good enough for our purposes.
https://mattermost.atlassian.net/browse/MM-40450
```release-note
NONE
```
* format using `goimports -local github.com/mattermost/mattermost-server/v5 -w`
* added goimports lint check to .golangci.yml
* format using `goimports -local github.com/mattermost/mattermost-server/v5 -w` for a corner case
* make app-layers, *-mocks and store-layers for ci check
Co-authored-by: Mahmudul Haque <mahmudulhaque@protonmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
* MM-24395: Set response header to be attachment for SVG images.
We check the file extension and appropriately set the response header.
SVG images without a file extension aren't proxied at all. So there's no
problem with that.
* Add test
* Improve test a bit
* Capture content type
* incorporate comments
* Set attachment mode in case of error too
* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* MM-13838 Bypass the HTTP client when getting image dimensions from the proxy
* Add additional log messages to debug failing test
* Fix unit test to work on Jenkins
* MM-10417 Add local image proxy and enable by default
* Remove unused function
* Add dependencies for willnorris/imageproxy
* Fixed compilation errors
* Lock to the master version of willnorris/imageproxy
* Fix atmos/camo proxy when no SiteURL is specified
* Re-add default values for deprecated settings
* Fix unit tests added by merge
* Pass imageproxy to App struct
* Remove unneeded locking when creating the image proxy
* Remove empty test file
