What does "Compression Method : null(0)" mean in Client Hello?

Question

As a task of my assignment, I used wireshark to capture packets. Now in Client Hello message, I saw compression method:null(0). Now I am confused what is that mean? Does that mean no compression is required? Or null(0) is itself a compression technique?

Click Here to see the image of compression method:null(0).

What traffic are you investigating? – muru Dec 28 '15 at 07:33 — muru, Dec 28 '15 at 07:33
investigating gmail – Nahid Hossain Shihab Dec 28 '15 at 07:34 — Nahid Hossain Shihab, Dec 28 '15 at 07:34

score 0 · Answer 1 · answered Feb 16 '21 at 05:54

Compression method: null (0) means that the data received from the record layer will not be compressed, nowadays SSL is not doing the compression for the data received from the upper layer because HTTP is doing the job for it at layer 7.

So usually, you will find this to be set as null.

score 0 · Answer 2 · edited Oct 07 '21 at 07:34

0

See section 6.2.2 and section 7.4.1.2 of RFC 5246.

edited Oct 07 '21 at 07:34

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answered Dec 28 '15 at 20:10

What does "Compression Method : null(0)" mean in Client Hello?

2 Answers2