How to parse TCP packet payload?

Only by analyzing content. Nothing in IP or TCP header what can mark "HTTP Request" packets. Even "first data packet in connection" wouldnot work because there are persistent connections.

Like the IP header, the TCP header is variable-length as well. You are not taking that into account. Rather than blindly subtracting sizeof(struct tcp_header)) from the total packet size, you need to locate the TCP header within the IP data, then use its length field (which needs to be multiplied by 4, just like the IP header length field does) to know where the actual data payload is located.

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