invisible http responses and multiple http responses

[esolve esolve <esolvepolito () gmail com>]

Hi,

   I used tcpdump to capture youtube packets, then I read those captured
pcap file with wireshark

   I noticed that some http responses (like http 200 OK) are invisible in
the wireshark and they are inside the TCP segment of an reasembled PDU. I
read the TCP data palyload and noticed them. These segments are following
directly after the corresponding http request. I also tried to identify
them through tcpshark but failed. So are there any ways to identify these
invisible http responses?

   Besides, when I follow a tcp stream for a http request-response, I
noticed near the end of the stream, there is usually a http 200 OK
response. Since there is already a http 200 OK response as mentioned above,
what is the http 200 ok near the end of the stream?  I tried to find the
corresponding HTTP request by looking at the the nearby packets that  are
before this http 200 OK packet but I can't find one. Does this mean there
are multiple http responses?

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