4/17/2023 0 Comments Wireshark protocol filter for ssl![]() Single TCP segment can either fit in ethernet frame (PDU), but can be split as well. So, even your single "chunk" can span multiple segments. But please note, that those segments have nothing in common with chunks, when chunked Transfer-Encoding is used, because that encoding is application level and TCP is the transport level of the OSI model. Sometimes applications just do send HTTP headers in single TCP segment and HTTP body in next one. The same can happen to HTTP response headers and mostly it does happen to HTTP request/response bodies. If the HTTP header is big enough to be split in segments (that's a rare issue, but happens if site is sending lots of cookies and optional X-headers), then you will see two or more packets in the wireshark capture, period. ![]() In fact there are at least three different issues with reassembling considered chunked HTTP transfer encoding and you must check your preferences very carefully, especially if you are dealing with 'endless' server connection sending chunks of messages.įirst, the application-level protocol packet, such as HTTP request may fit in single TCP segment, and may not. Note that there are quite a lot of duplicate messages where the difference is just in the port this is because it is simulating many clients (500 in this one, I believe). ![]() In this particular trace, it looks like the switchover from "reassembled PDU" to "HTTP continuation" starts at number 6054/6055. Can anyone shed some light on these two concepts for me? I'm quite confused because when I compare a "Continuation" packet with a "TCP segment" packet, they look nearly identical (the differences being minor details such as the timestamp). The size of the content is therefore unknown and cannot be provided in the header. Each client initiates an HTTP connection (using GET) and the server proceeds to send back chunked data indefinitely. The trace comes from a simulation of client-server interaction using HTTP streaming. ![]() I'm curious as to what the difference between the two is. I'm examining results from tcpdump using wireshark/tshark and I'm seeing many packets with info "Continuation or non-HTTP traffic" and many other packets with info "". ![]()
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