gocal | ICS file parser in Golang

As you have figured, the http.Response.Body is exposed as an io.Reader, this reader is not re usable because it is connected straight to the underlying connection* (might be tcp/utp/or any other stream like reader under the net package). Once you read the bytes out of the connection, new bytes are sitting their waiting for another read.

In order to save the response, indeed, you need to drain it first, and save that result within a variable.

body, _ := io.ReadAll(get.Body)

To re use that slice of bytes many time using the Go programming language, the standard API provides a buffered reader bytes.NewReader.

This buffer adequately offers the Reset([]byte) method to reset the state of the buffer.

The bytes.Reader.Reset is very useful to read multiple times the same bytes buffer with no allocations. In comparison, bytes.NewReader allocates every time it is called.

Finally, between two consecutive calls to c.Parser, you should reset the buffer with bytes buffer you have collected previously.

such as :