pub struct Version {
    pub http_0_9: &'static str,
    pub http_1_0: &'static str,
    pub http_1_1: &'static str,
    pub http_2_0: &'static str,
}
Immutably borrows from an owned value. 
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Mutably borrows from an owned value. 
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Returns the argument unchanged.
Calls U::from(self).
That is, this conversion is whatever the implementation of
From<T> for U chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.