If-Modified-Since problem

[tikeau]

Hi, it seems to be an edge case, but,

if a client request a picture with an If-Modified-Since header, the source webserver replies with a 304 status code and an empty body, so the plugin cannot pipe the picture to imaginary and replies to the client with a 200 and an empty body.

one fix could be removing the header before fetching the source server.

[agravelot]

Hi,

First, good catch for this issue!
I don't see any other way to solve this problem.

You should be able to solve this issue by removing the header in the request before this line (it calls the remote backend service).

traefik-image-optimization/image_optimizer.go

Line 109 in de58320

a.next.ServeHTTP(wrappedWriter, req)

Feel free to open a pull request, test is highly appreciated!