The Silent Pixel
Medium 35 ptsThe lab loads a 1×1 image. The image is meaningless; the response that carries it is not. The server attaches a flag header and the page throws it away without looking. Catch it on the way in.
Hints
Open them in order. They nudge, they do not solve.
Hint 1
This one is in the response — the server's half of the conversation.
Hint 2
Reload the lab with the capture running; the image is fetched on every load.
Hint 3
Filter http.response, find the one returning an image, read its headers.
Your live lab
Plain HTTP on port 9080 — no TLS, so your capture is readable end to end. Start capturing on your Wi-Fi interface first, then open this and use the buttons.
Display filter: tcp.port == 9080