Timelapse problem

What is the problem?

The tmp sub directory of timelapse directory contains my pictures for the timelapse but each files have the same size 3004 bytes... So each files are corrupted.

What did you already try to solve it?
I Try to verify the url of the timelaps conf in the octoprint and on the web page I have the test picture on the screen.

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, octoprint.log, serial.log or output on terminal tab, ...)

My octoprint is the latest version 1.3.10 on a rapsberry pi 3 with Raspbian GNU/Linux 9.8 (stretch)|

the printer is an Ender 3

For fun, what are the contents of the files (if they are readable)?

Otherwise, please post your timelapse url from the config and the octoprint.log.

I have this error when I try to open an image file with gimp :
failed: JPEG image plug-In could not open image

My timelapse URL is : http://192.168.0.32:8080/?action=snapshot and the test on the octoprint web interface works fine

Here is the octoprint.log file
octoprint.log (63.5 KB)

And the content of the image generated by octoprint is an html page... with Details about the M-JPEG streamer...