Declared but not used

It is a compiler error in Go to declare a variable without using it.

In the code in you’re example the variable partial is never used, only assigned, so is seen as unused. If you added additional code that read the variable then the error would be resolved. For example

var partial string

for i, request := range requestVec {
    if i == (len(requestVec)-1) && !strings.Contains(request, "\r\n\r\n") {
        partial = request
        break
    }
}

fmt.Println(partial) // We are now using `partial`

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