![]() If you want the content of the page to show up in a network trace, you would have to convince your browser to discard any copy it's saved, so that it doesn't use If-Modified-Since I don't know how that's done with Firefox (I assume, from the headers, that you're using Firefox), but repeatedly trying to fetch the page might be treated as a "discard the cached copy" indication, and there might also be ways in the Firefox UI to discard cached copies of pages. Transfer of the selected representation's data is avoided if thatĪs you can see, the reply, in the next packet, has a reply of "304 Not Modified", meaning that the page in question hasn't changed since the time specified in the If-Modified-Since header, so any copy the machine already fetched at that time is Good Enough. Method conditional on the selected representation's modification dateīeing more recent than the date provided in the field-value. HTTP supports an "If-Modified-Since" header as the RFC says: The "If-Modified-Since" header field makes a GET or HEAD request The other thing that you’ll need to do before decrypting TLS-encrypted traffic is to configure your Web browser to export client-side TLS keys. Wireshark is a popular open-source packet analyzer that runs on Windows, macOS, and Linux. The first step in using it for TLS/SSL encryption is downloading it from here and installing it. Once you've captured network packets with tcpdump, you can first download it to your local machine by following this guide, and then analyze them using a packet analyzer such as Wireshark. Select File > Save As or choose an Export option to record the capture. ![]() Select the shark fin on the left side of the Wireshark toolbar, press Ctrl+E, or double-click the network. There are other ways to initiate packet capturing. ![]() You can't get it from the response that packet, because it's not delivered! Wireshark is a commonly-known and freely-available tool for network analysis. In the Wireshark Capture Interfaces window, select Start.
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