chromium/third_party/blink/web_tests/http/tests/devtools/network/network-not-modified-images-mime-type-expected.txt

Tests that if an image is cached and the server responds with 304, the image MIME type is shown correctly.

http://127.0.0.1:8000/devtools/network/resources/resource.php?type=image&cached=1 200 image/png
Page reloaded.
http://127.0.0.1:8000/devtools/network/resources/resource.php?type=image&cached=1 304 image/png