What are frist 9 bytes of HTTP Response

on the server side i m doing some operation and then write a few bytes to the http response output stream if the operation is successful and if operation is unsuccessful i do not write anything. on the client side when i do an HTTP post request to this server side component, in the response i get 9 bytes + data (if the operation on server side was successful ) or just 9 bytes(if the operation was unsucessful). What are these 9 bytes. What does response body contains by default ?

One of the things that the response header always contains is a 3 digit code indicating the outcome. For example 200 is no errors/html should follow, 404 is file not found, 302 is redirection (I think), etc... I think if you get a 200 code, there should be a content length which indicates the size of the html which will follow. I'm not sure what else would always be in the header. What are the 9 bytes you are seeing?

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>
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Edit 1:
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What are frist 9 bytes of HTTP Response

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